As was posted in the bug report forum, I accidentally introduced a new bug in 5.02.02 when I rewrote the action bar code to get rid of the taint problem. The new bug is preventing the main action bar from updating when you change pages (or forms) while in combat.
I expect to upload a 5.02.04 with the fix for that sometime today.
What people don't get is that I am, ultimately, an artist at heart. My brush has two colors, 1 and 0, and my canvas is made of silicon.