DropboxInfiniteProxyHelper quit unexpectedly. How can I resolve this?

Hi Walter​ , I am actually kulath, but I have had to login with a different name, because when I try to access https://www.dropboxforum.com/, using my kulath​   account I get "We're sorry, but you have been banned from using this site.". I still seem to be able to access the main Dropbox site, and my account details and content there; it is just the forum that I seem to have been banned from.

Could you please unban the kulath account from the forum.

I have tried the advanced instal, but it makes no difference, I still get the error. I checked the certificate, and it seems OK:

$ codesign --display --verbose=4 /Applications/Dropbox.app/Contents/XPCServices/DropboxInfiniteProxyHelper.xpc/Contents/MacOS/DropboxInfiniteProxyHelper
Executable=/Applications/Dropbox.app/Contents/XPCServices/DropboxInfiniteProxyHelper.xpc/Contents/MacOS/DropboxInfiniteProxyHelper
Identifier=com.getdropbox.dropbox.InfiniteProxyHelper
Format=bundle with Mach-O thin (x86_64)
CodeDirectory v=20500 size=534 flags=0x10000(runtime) hashes=7+5 location=embedded
VersionPlatform=1
VersionMin=720896
VersionSDK=984064
Hash type=sha256 size=32
CandidateCDHash sha1=be02b1df540e52746a9531ed43da50f17f9c15b2
CandidateCDHashFull sha1=be02b1df540e52746a9531ed43da50f17f9c15b2
CandidateCDHash sha256=82010fdcaeb6d16f8717056f434e168dc07eb223
CandidateCDHashFull sha256=82010fdcaeb6d16f8717056f434e168dc07eb22360731edffa35e43ddebfe587
Hash choices=sha1,sha256
CMSDigest=fc32cad0b2173c47a989ffd8fcff2679886a90f2c631692fa77099704737236b
CMSDigestType=2
Page size=4096
CDHash=82010fdcaeb6d16f8717056f434e168dc07eb223
Signature size=9148
Authority=Developer ID Application: Dropbox, Inc. (G7HH3F8CAK)
Authority=Developer ID Certification Authority
Authority=Apple Root CA
Timestamp=9 Sep 2025 at 12:23:11
Info.plist entries=21
TeamIdentifier=G7HH3F8CAK
Runtime Version=15.4.0
Sealed Resources version=2 rules=13 files=1
Internal requirements count=1 size=204
$ codesign --verify --verbose /Applications/Dropbox.app/Contents/XPCServices/DropboxInfiniteProxyHelper.xpc/Contents/MacOS/DropboxInfiniteProxyHelper
/Applications/Dropbox.app/Contents/XPCServices/DropboxInfiniteProxyHelper.xpc/Contents/MacOS/DropboxInfiniteProxyHelper: valid on disk
/Applications/Dropbox.app/Contents/XPCServices/DropboxInfiniteProxyHelper.xpc/Contents/MacOS/DropboxInfiniteProxyHelper: satisfies its Designated Requirement

Step 3 of the advanced reinstall says; "When the uninstall finishes, restart your computer.", but this doesn't make much sense, because the only step advised is to move the application to the trash, which happens instantaneously. Was this step intended for when there was an uninstall inside the package, as there is for some applications.

Thanks, would be very grateful for an email contact.