I've found a minor irritation in the subtypes window. If you have a few subtypes and have to scroll to the right, the tables goes out of alignment. Suddenly the domains you wanted to ensure were consistently applied are now not in the row where you started.
You can pull the tab out and the issue goes away. Re-dock it, it returns. It doesn't cause a crash. It's just a minor annoyance.
What's most odd is how the alignment corrects itself after 2 incorrect subtypes.