I think there is a problem with the way permissions are set when uploading files. As admin, when I add new files to a library by file path upload, I select just one specific role which is a group of people (at the bottom of the upload page). There are several different roles available, as well as single users. When I select the single role, it gets highlighted as expected in the drop down list and I click Upload to library. After upload is complete I find that the Access permissions always include me as a single user in addition to the role I actually selected during upload. This causes access to be denied to the role (the group) because there is now a personal role associated with the library.