I don't think I've ever done an install of Debian with either Gnome or Mate, but considering those are, best I can tell, two of the three most popular desktop environments among mainstream Linux users(KDE being the third), I find it hard to believe that something as big as an endless loop of trying to log-in, crashing, and being booted back to the log-in screen would go unfixed pre-release if it were a common problem... combined with having no idea how common having multiple sound cards is, it makes me wonder how much of the problem is genuine buggieness on Bulls-eye's part and how much is due to unusual hardware setup...
Kind of want to try out the new release to find out if I encounter similar problems, but I don't want to risk my main system, don't have a spare hard drive I could swap out for experimentation, and if memory serves, the last time I tried hooking up the closest thing I have to a backup machine, it wouldn't boot at all.