Report your bugs here - if someone else has already mentioned the same bug, just add on to their post with as much info as possible to make the hunting easier.
Mid-2010 Mac Pro, macOS Sierra 10.12.1
Bookpedia 5.5.0
(Probably happens in DVDpedia as well, not tested.)
See image below showing a dialog with a very wide button containing the same text as the message in the dialog. I assume this was not intentional. This happened when I tried to View->Set As Default Columns on a folder containing multiple smart lists.