I'm having the same issue, although we have Admins and Group Admins and no missing/unidentified keys.
My testing shows that only Admins and Group Admins can remove a file from Netshare, even after copying it out of the protected folder (e.g. onto their desktop).
Save As.. doesn't seem to work although I hear that varies depending on the file type and app used.
Emailing it to yourself does work, but the whole point of implementing netshare was to avoid emailing around sensitive files!
From reading the documentation, it seems that the intended functionality is for all users to be able to decrypt files if they really need to. The interim solution is to make everyone a Group Admin, but that's undesirable and means re-encrypting the entire file share :(
Does anyone have a solution for this by any chance?
Cheers,