[Mukashi]

Well, our forums server is currently unresponsive (seems to be an Apache crash, can't get into the cpanel or WHM), but from what you've said I can only conclude that someone else logged in with the details we gave you. I'll have to check the logs when everything's back up, and I'll get back to you when I know what's happened. Not sure if that's indicative of a security issue at our end, or if perhaps that info was somehow pulled from your PM's.

EDIT: Okay, just went and uninstalled the addon, deleted all the files, then reuploaded and reinstalled using the archive from the DBTech site, and got the following error as I did (this error appearing after adding tables, but before editing the styles)
Warning: array_merge() [function.array-merge]: Argument #1 is not an array in [path]/includes/adminfunctions_plugin.php on line 1557
The addon finished installing, but presumably that error may be the cause of all our issues.

Still have a copy of 2.0.4 sitting on my HDD, so I'll try installing that one....
Okay, same error on installation, same place.

According to vBulletin, /includes/adminfunctions_plugin.php was modified in vBulletin 4.1.11, so there's the problem I think.

As for those logs BTW, I'm not seeing anything weird about the access from the account you used, so I've got no idea what's gone on there, or why it was saying you'd used 5GB of FTP transfer. *shrugs*