OK, I have never had this add on prob with a new patch, but i wasn't around when BC started, so it may be because of WoTLK.  I have deleted all of my old addons, and downloaded and reinstalled the new ones manually.  Now none of them are even showing up in my menu.  In fact, all of my old adds that I have deleted are still showing up and popping up errors.  For example, I deleted Bartender 3 and downloaded Bartender 4.  Now Bartender 3 is still in my addon menu, but BT4 isn't even showing up.  Is anyone else having this issue, or does anyone know a fix.  Also, as a side issue, I can't seem to be able to hearth anymore.  This patch sux and wasn't ready.

I'm having the same exact problem. More then likly due to the new patch. Hopefully they resolve it quickly.

that happened to me too, moved everything to public folder......some of the addons worked, some didn't :(

I figured out the problem.  At least with Vista, it moves EVERYTHING to your public games folder.  I just moved the folder back to program files and it's all good.  The problem with hearthing was due to Onebag.  It is completely FUBAR and wouldn't even let me get into my bank or sell to a vendor.  Sigh.  I miss my adds...