If this is on 8.1.22 it may be a regression bug. Check your logs for errors like "Error processing edit for tag path" discussed towards the end of this thread (the top of the thread has to do with unrelated EAM issues and you can ignore it):
If this is on 8.1.22 it may be a regression bug. Check your logs for errors like "Error processing edit for tag path" discussed towards the end of this thread (the top of the thread has to do with unrelated EAM issues and you can ignore it):