Thank you for your response. At the moment the user I was just talking to is still able to access documents, having quit and restarted Dropbox a few minutes ago, but we will get you a screenshot as soon as we can. Logically, if Dropbox is shut down, the documents are inaccessible to the user. Taking a local copy of one of the Db docs to use when Db is not running, replicates the permissions that the Windows system has applied to it, so it still cannot be opened. This was all running fine until about a week ago. Similar documents shared among users on Sharepoint (for example) do not exhibit the issue. Even if it is the case that the issue has been introduced by security updates on Mac or Windows, other people are likely to run into it and it's a problem of sufficient impact that it might force us off Dropbox.
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We have just run into a problem which is expressed well by this Reddit user: https://www.reddit.com/r/techsupport/comments/blqd1u/file_access_errors_using_mac_office_and_dropbox/ Basically, if a Windows user logged onto the business domain simply accesses a shared MS Word or Excel document - no editing necessary - this immediately prohibits non-domain Mac users from opening it, from home or anywhere else: they get the dreaded error 'user does not have access privileges'. Rebooting the Mac allows access again for 10 mins or so. This pretty much makes Dropbox unusable for the team - I hope that the Dropbox people are aware of the issue and are working on it?
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