The app seems to be crashing on macOS Tahoe 26.4 (Beta 1)

sspilleman​ We've been told the latest 26.4 beta update (25E5218f) should have a fix for the external drive read-only issue. Based on our telemetry, your last attempt failed due to a transient network issue and not the read-only drive issue. Could you try again (no need to update Dropbox app version) and report back?

Hi LynnDbx​ 

I know... This was related to an issue with HFS+ drives in beta 2 becoming readonly. This is already fixed in the beta released right after the buggy one.

I just upgraded again to the latest beta (25E5223i).... The dropbox issue still exists

And also: My dropbox folder is on the default folder, not on an external drive

Hi sspilleman​,

I just spoke with LynnDbx​ and we were wondering if you could try doing an advanced reinstall?

It's possible that your permissions for your Dropbox folder got messed up and doing an advanced reinstall may help.

Hi LynnDbx​ , I just upgraded to macOS 26.4 beta 4, Issue still exists, also took the latest dropbox installer. Logs:

bn.BUILD_KEY: Dropbox
bn.VERSION: 244.3.6525
bn.constants.WINDOWS_SHELL_EXT_VERSION: 90
bn.is_frozen: True
pid: 1460
ppid: 1
uid: 501
euid: 501
gid: 20
egid: 20
group_info: grp.struct_group(gr_name='staff', gr_passwd='*', gr_gid=20, gr_mem=['root'])
effective_group_info: grp.struct_group(gr_name='staff', gr_passwd='*', gr_gid=20, gr_mem=['root'])
DYLD_LIBRARY_PATH: None
cwd: '/'
     real_path='/'
           	mode=0o40755	uid=0	gid=0
     parent	mode=0o40755	uid=0	gid=0
HOME: '/Users/sander'
appdata: '/Users/sander/.dropbox/instance3'
         real_path='/Users/sander/.dropbox/instance3'
               	mode=0o40700	uid=501	gid=20
         parent	mode=0o40755	uid=501	gid=20
dropbox_path: '/Volumes/Data/.CloudStorage/Data/Dropbox'
              real_path='/Volumes/Data/.CloudStorage/Data/Dropbox'
                    	mode=0o40700	uid=501	gid=20
              parent	mode=0o40755	uid=501	gid=20
sys_executable: '/Applications/Dropbox.app/Contents/MacOS/Dropbox'
                real_path='/Applications/Dropbox.app/Contents/MacOS/Dropbox'
                      	mode=0o100775	uid=501	gid=20
                parent	mode=0o40775	uid=501	gid=20
trace.__file__: '/Applications/Dropbox.app/Contents/Resources/python-packages.zip/dropbox/client/ui/common/boot_error.pyc'
                real_path='/Applications/Dropbox.app/Contents/Resources/python-packages.zip/dropbox/client/ui/common/boot_error.pyc'
                      	not found
                parent	not found
tempdir: '/var/folders/v5/1fn_t3055sd904vr0bg75ts40000gn/T'
         real_path='/private/var/folders/v5/1fn_t3055sd904vr0bg75ts40000gn/T'
               	mode=0o40700	uid=501	gid=20
         parent	mode=0o40755	uid=501	gid=20
Traceback (most recent call last):
  File "desktop/dropbox/fs_api/lifecycle.py", line 238, in client
  File "desktop/dropbox/fs_api/lifecycle.py", line 297, in _create_thin_client
  File "desktop/dropbox/fs_api/fs_api_adapter.py", line 54, in __init__
  File "desktop/extensions/fs_api/fs_api_python.pyx", line 63, in fs_api_python.FsApiServer.__cinit__
fs_api_python.FsApiError: "Initializing fs api |>> Initializing platform |>> Opening worker root directory |>> open syscall |>> FSErrorCode::PermissionDenied"

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "desktop/dropbox/client/main.py", line 1108, in wrapper
  File "desktop/dropbox/client/main.py", line 8876, in finish_dropbox_boot
  File "desktop/dropbox/client/message_queue.py", line 338, in _wrapped
  File "desktop/dropbox/client/main.py", line 8157, in _init_components_for_account
  File "desktop/dropbox/client/main.py", line 8065, in create_sync_engine
  File "desktop/dropbox/sync_engine_boundary/factory.py", line 237, in make_sync_engine
  File "desktop/dropbox/sync_engine/nucleus/classic_client/sync_engine.py", line 264, in __init__
  File "desktop/dropbox/sync_engine/nucleus/classic_client/modern_client/modern_client.py", line 330, in __init__
  File "desktop/dropbox/sync_engine/nucleus/classic_client/modern_client/base.py", line 260, in __init__
  File "../mac_arm64_dropbox_virtual_env/lib/python3.11/functools.py", line 1001, in __get__
  File "desktop/dropbox/fs_api/lifecycle.py", line 267, in client
dropbox.fs_api.lifecycle.FsApiClientCreationException: "Initializing fs api |>> Initializing platform |>> Opening worker root directory |>> open syscall |>> FSErrorCode::PermissionDenied"

Sorry Neal​ , don't have to time, and I also don't think you want to ask all macOS users to do the same after 26.4 hits GA.

Just shared the latest logs with LynnDbx​ in another thread, but will copy here as well

bn.BUILD_KEY: Dropbox
bn.VERSION: 244.3.6525
bn.constants.WINDOWS_SHELL_EXT_VERSION: 90
bn.is_frozen: True
pid: 1460
ppid: 1
uid: 501
euid: 501
gid: 20
egid: 20
group_info: grp.struct_group(gr_name='staff', gr_passwd='*', gr_gid=20, gr_mem=['root'])
effective_group_info: grp.struct_group(gr_name='staff', gr_passwd='*', gr_gid=20, gr_mem=['root'])
DYLD_LIBRARY_PATH: None
cwd: '/'
     real_path='/'
           	mode=0o40755	uid=0	gid=0
     parent	mode=0o40755	uid=0	gid=0
HOME: '/Users/sander'
appdata: '/Users/sander/.dropbox/instance3'
         real_path='/Users/sander/.dropbox/instance3'
               	mode=0o40700	uid=501	gid=20
         parent	mode=0o40755	uid=501	gid=20
dropbox_path: '/Volumes/Data/.CloudStorage/Data/Dropbox'
              real_path='/Volumes/Data/.CloudStorage/Data/Dropbox'
                    	mode=0o40700	uid=501	gid=20
              parent	mode=0o40755	uid=501	gid=20
sys_executable: '/Applications/Dropbox.app/Contents/MacOS/Dropbox'
                real_path='/Applications/Dropbox.app/Contents/MacOS/Dropbox'
                      	mode=0o100775	uid=501	gid=20
                parent	mode=0o40775	uid=501	gid=20
trace.__file__: '/Applications/Dropbox.app/Contents/Resources/python-packages.zip/dropbox/client/ui/common/boot_error.pyc'
                real_path='/Applications/Dropbox.app/Contents/Resources/python-packages.zip/dropbox/client/ui/common/boot_error.pyc'
                      	not found
                parent	not found
tempdir: '/var/folders/v5/1fn_t3055sd904vr0bg75ts40000gn/T'
         real_path='/private/var/folders/v5/1fn_t3055sd904vr0bg75ts40000gn/T'
               	mode=0o40700	uid=501	gid=20
         parent	mode=0o40755	uid=501	gid=20
Traceback (most recent call last):
  File "desktop/dropbox/fs_api/lifecycle.py", line 238, in client
  File "desktop/dropbox/fs_api/lifecycle.py", line 297, in _create_thin_client
  File "desktop/dropbox/fs_api/fs_api_adapter.py", line 54, in __init__
  File "desktop/extensions/fs_api/fs_api_python.pyx", line 63, in fs_api_python.FsApiServer.__cinit__
fs_api_python.FsApiError: "Initializing fs api |>> Initializing platform |>> Opening worker root directory |>> open syscall |>> FSErrorCode::PermissionDenied"

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "desktop/dropbox/client/main.py", line 1108, in wrapper
  File "desktop/dropbox/client/main.py", line 8876, in finish_dropbox_boot
  File "desktop/dropbox/client/message_queue.py", line 338, in _wrapped
  File "desktop/dropbox/client/main.py", line 8157, in _init_components_for_account
  File "desktop/dropbox/client/main.py", line 8065, in create_sync_engine
  File "desktop/dropbox/sync_engine_boundary/factory.py", line 237, in make_sync_engine
  File "desktop/dropbox/sync_engine/nucleus/classic_client/sync_engine.py", line 264, in __init__
  File "desktop/dropbox/sync_engine/nucleus/classic_client/modern_client/modern_client.py", line 330, in __init__
  File "desktop/dropbox/sync_engine/nucleus/classic_client/modern_client/base.py", line 260, in __init__
  File "../mac_arm64_dropbox_virtual_env/lib/python3.11/functools.py", line 1001, in __get__
  File "desktop/dropbox/fs_api/lifecycle.py", line 267, in client
dropbox.fs_api.lifecycle.FsApiClientCreationException: "Initializing fs api |>> Initializing platform |>> Opening worker root directory |>> open syscall |>> FSErrorCode::PermissionDenied"

Latest 16.4 build (26.4 Beta (25E5233c)), Latest dropbox version, issue still exists:

bn.BUILD_KEY: Dropbox
bn.VERSION: 244.3.6525
bn.constants.WINDOWS_SHELL_EXT_VERSION: 90
bn.is_frozen: True
pid: 1460
ppid: 1
uid: 501
euid: 501
gid: 20
egid: 20
group_info: grp.struct_group(gr_name='staff', gr_passwd='*', gr_gid=20, gr_mem=['root'])
effective_group_info: grp.struct_group(gr_name='staff', gr_passwd='*', gr_gid=20, gr_mem=['root'])
DYLD_LIBRARY_PATH: None
cwd: '/'
     real_path='/'
           	mode=0o40755	uid=0	gid=0
     parent	mode=0o40755	uid=0	gid=0
HOME: '/Users/sander'
appdata: '/Users/sander/.dropbox/instance3'
         real_path='/Users/sander/.dropbox/instance3'
               	mode=0o40700	uid=501	gid=20
         parent	mode=0o40755	uid=501	gid=20
dropbox_path: '/Volumes/Data/.CloudStorage/Data/Dropbox'
              real_path='/Volumes/Data/.CloudStorage/Data/Dropbox'
                    	mode=0o40700	uid=501	gid=20
              parent	mode=0o40755	uid=501	gid=20
sys_executable: '/Applications/Dropbox.app/Contents/MacOS/Dropbox'
                real_path='/Applications/Dropbox.app/Contents/MacOS/Dropbox'
                      	mode=0o100775	uid=501	gid=20
                parent	mode=0o40775	uid=501	gid=20
trace.__file__: '/Applications/Dropbox.app/Contents/Resources/python-packages.zip/dropbox/client/ui/common/boot_error.pyc'
                real_path='/Applications/Dropbox.app/Contents/Resources/python-packages.zip/dropbox/client/ui/common/boot_error.pyc'
                      	not found
                parent	not found
tempdir: '/var/folders/v5/1fn_t3055sd904vr0bg75ts40000gn/T'
         real_path='/private/var/folders/v5/1fn_t3055sd904vr0bg75ts40000gn/T'
               	mode=0o40700	uid=501	gid=20
         parent	mode=0o40755	uid=501	gid=20
Traceback (most recent call last):
  File "desktop/dropbox/fs_api/lifecycle.py", line 238, in client
  File "desktop/dropbox/fs_api/lifecycle.py", line 297, in _create_thin_client
  File "desktop/dropbox/fs_api/fs_api_adapter.py", line 54, in __init__
  File "desktop/extensions/fs_api/fs_api_python.pyx", line 63, in fs_api_python.FsApiServer.__cinit__
fs_api_python.FsApiError: "Initializing fs api |>> Initializing platform |>> Opening worker root directory |>> open syscall |>> FSErrorCode::PermissionDenied"

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "desktop/dropbox/client/main.py", line 1108, in wrapper
  File "desktop/dropbox/client/main.py", line 8876, in finish_dropbox_boot
  File "desktop/dropbox/client/message_queue.py", line 338, in _wrapped
  File "desktop/dropbox/client/main.py", line 8157, in _init_components_for_account
  File "desktop/dropbox/client/main.py", line 8065, in create_sync_engine
  File "desktop/dropbox/sync_engine_boundary/factory.py", line 237, in make_sync_engine
  File "desktop/dropbox/sync_engine/nucleus/classic_client/sync_engine.py", line 264, in __init__
  File "desktop/dropbox/sync_engine/nucleus/classic_client/modern_client/modern_client.py", line 330, in __init__
  File "desktop/dropbox/sync_engine/nucleus/classic_client/modern_client/base.py", line 260, in __init__
  File "../mac_arm64_dropbox_virtual_env/lib/python3.11/functools.py", line 1001, in __get__
  File "desktop/dropbox/fs_api/lifecycle.py", line 267, in client
dropbox.fs_api.lifecycle.FsApiClientCreationException: "Initializing fs api |>> Initializing platform |>> Opening worker root directory |>> open syscall |>> FSErrorCode::PermissionDenied"

sspilleman​ Could you let us know the permissions set on your Dropbox folder right now? We suspect Dropbox app has lost permissions to the folder which is why this error is happening. If you right-click your Dropbox folder and then select "Get Info", near the bottom of the Info window, it should list out the users with access to the folder and what permission they have (read, write or read & write).

sspilleman​ I tried everything they suggested and nothing worked. In frustration, I decided to reformat my hard drive and revert to the non-beta version. 

I'm not on beta though....