Creating new bookmarks in Enovia Bookmark Editor

We use bookmarks extensively to structure our CAD documents. However, the Bookmark Editor is quite stubborn sometimes. One day everything works fine, and the other day I can't create bookmarks or upload files in any location. Only adding existing documents does not seem to be affected. The message attached shows an example for one of the various error messages that shows up when it is not working. Anyone else here having this problem and may have some insight?