Please note I do not have ANY FrameXML folders. I've been a strict No-FrameXML Addon policy holder forever, and yet when I try to open my default First Aid or Alchemy pane, I get these FrameXML errors coming up (the pane's contents are visible however). I have no addons that have anything to do with altering tradeskills.
Interface\FrameXML\UIPanelTemplates.lua:7:attempt to index local 'frame' (a nil value)
Blizzard actually created a bug in their own XML by making these 'Addons' load on demand? Well, that's how it seems anyway, if I were to wager a guess after just having took a peek at the UIPanelTemplates.lua myself.
The best advice I can give you is this; (first backup your Addons folder then) open up the toc files of the Blizzard Addons and remove the '## LoadOnDemand: 1' lines from all the Blizzard Addons and see if that solves your problem.
After I read Grufnuff's post on Curse the 13:th and hence he had errors when trying to log out I did not even try the 1.4, I thought it was better to wait a few days (yes I know...maby I'm a bit lazy, but I can live without rpgoCP for a few days ;) ).
1.8 patch - errors I'm having problems now that I'm using the 1.8 patch - basically get a red error string with an OK button whenever I try and do anything with rpgo. The string just says "...rface\AddOns\CharacterProfiler\Character...". I have to disable the mod (/cp off) to logout.