In 2.0 RC6 x86 version I find that I can load the Gobabis map no problem but by the time the first or second alien fires the game terminates and basically CTDs. There is no error popup or anything, so I really don't know what the problem is yet.
*** Edit ***
Heh, I'm learning to do more reading before posting things like this. Turns out this has been reported and fixed in the next version.