Unfortunately, it appears that more is broken in the thumbnail functionality.
I have purged my cache, but my albums are inheriting thumbnail parameters from my gallery.
I understand that if an album does not have a specific theme assigned to it then it is supposed to inherit those properties.
But as far as I can tell, if you UNCHECK the "crop thumbnails" button for a specific album, then instead of using the "thumbsize" value that you enter, it inherits the "thumbsize" value from the gallery.