Upgrading causes theme views to be ignored until reset

[JakeGinnivan]

What steps will reproduce the problem? 1. Upgrade FW files and db(I went from dbv20 -> dbv22/latest at time of issue) 2. Notice theme is out of whack - custom views are being ignored, just CSS is being merged in. My custom views don't use base.css at all, so it was easy to see.
The "fix" is to just go into admin, select a different theme, save, then select your theme again and save.