Ive had a quick look at your code, and i couldnt figure out anything inapprorpiate immediately. WIll try to have a closer look.
If you have time at hand now, why not comment each of those 3 Dialogs one by one and localize it.

comment out this as well in MainWindow::addCharacter(), since you said it occurs even without them.
// This is to prevent Maemo bug #9883
appMenu->setEnabled(false);
waitDialog->show();
connector->requestAccount(userId, apiKey);