I've noticed this after upgrading to Windows 10. It may be irrelevant though.
When I choose Edit --> Edit Watermarks it does not return anything and whole program freezes.
Anybody has experienced the same?
Where is the File located that you are trying to edit?(Internal/External drive)
Similar behaviors known to freeze to crash/freeze after upgrading to Win10:-
Does the Program Freezes too when you >>Develop a picture come back to Library Module select another picture and go to Develop module again?
>>Crashing /Freezing when you go to Edit>Preferences?
Go to Edit>>Catalog Settings>>General
and backup your catalog as well
Make sure you have updated Graphics driver
I did not experience Edit -> Preferences freeze after Developing a picture.
It looks like there will be new patched to fix the issues.
Thanks for your response.