Have you tried to colonize another system? (if you can't then there might be a problem), I have no problems...
Sorry for the delay (had to update my CIV Gold scens to CIV Gold BTS 4.0 Final, which was released early last week), but I think I did. I dorta gave up when I scouted around alot and never met any other civs or barbs plus the advances didn't seem to give any benefits. So after I checked the civpedia and saw no further buildings or units or anything I sorta chucked it in.