If you go into your WTF/Account/You/SavedVariables/Swatter.lua file, you should be able to find the error (look at timestamps)
As for the ban, however, it is extremely unlikely that Gatherer (or any other wholely in-game addon) was the cause of it. If you feel that Blizzard banned you without cause, please take it up with them.
well i talked to them and they said it was from a mod i'm waiting for them to email me back telling me what mod and since the only thing i did was update gatherer i'm guessing it was gatherer i talked to a few people in my guild who also updated and they been banned too i've added nothing new just updated gatherer and was on the only char that runs gatherer at the time
Where'd you download gatherer from? If you downloaded it from here, I'll eat my computer before I believe it was the cause of the ban. Let us know what Blizz says when they get back to you.
so gatherer may be in the clear between wow ace and gatherer there was some kind of injectors that was detected over 200kk have been banned as of today they are investagating it and restoreing accounts slowly so fyi becareful of updateing today
the only type(that I know of) of 'injector' thats going to get you banned is injecting an active process / driver to cheat. It is always suggested you download the lua files for addons themselves and NOT use any type of executable updating software for addons, a wow addon itself is NOT capable that and it doesn't make sense that ace/ gatherer had anything to do with this. Gatherer is downloaded via svn or zip and extracted by the end user and not by an executable. Don't really know anything about wowaces updater so I wont go there but its not very likely that its an issue either.
I believe it was the practice of arranging with other teams for one team or the other to throw the fight in the arena, though I'm not 100% familiar with it, either. There was a blue post about it on the forums.