Recently I’ve come across an issue on various project files and have been unable to pinpoint a cause or figure out how to reproduce the problem on demand.
Basically in a workset enabled project, there are times when during a synchronization with the central file, filters get renamed and a number gets appended at the end. So Filtername becomes Filtername1. The requirement seems to be that there is more than one person working on the project and that the renamed filters are being used in some views where multiple users are making changes. If only one person is working in their local and synchronizing regularly, renaming does not occur.
A peculiar thing that happens in this case is that Revit issues the familiar yellow warning dialog while saving but this message is actually blank and goes away on its own almost instantly. Also, nothing is captured in the journal, which makes troubleshooting really difficult. This was filed with Autodesk Support but due to the difficulty in tracing the root cause, not much can be done about it.
If you have experienced this problem or have managed to put your finger on the cause, please send a comment or email me. Maybe we can provide enough data to uncover the culprit.