Should have known not to upgrade right away. In the future, might I suggest WordPress get rid of the damn annoying bug that SCREAMS at you to upgrade? I NEVER would have upgraded if it wasn't for that annoying thing and the fact that the upgrade process is so freaking "easy." Or add a downgrade option. I've ceased letting these type of things upset me, I'll put up with not being able to change my sidebars in the hopes that you all will most likely issue a fix post haste.
Maybe you should make a bit harder to save us from ourselves. Especially when you release buggy crap like this. Usually WP's quality control is really good and I commend the Developers but I don't know how major things like breaking TinyMC and the Widgets slip through.