I just upgraded to 1.5.61 and I'm noticing an oddity. When I save my file, close it, and reopen the file, there are suddenly new, empty classes listed with names like "Dz45wg..." It almost looks like the name is the result of a hash. The original file was created in version 1.5.5 Is anyone else seeing the same and/or do you have an idea of how to fix it?