I've installed a nice WPMU 1.0 installation at http://auditblogs.com and I've already gained a few authors. One of the authors has invoked Spam Karma 2 for his blog but says that there is no Spam Karma tab in the Admin menu under Options.
This means that he cannot check his own "recent spam harvest" for posts which SK has marked as spam but which aren't.
Does anyone else have this problem and what is the fix?