Saw this mentioned in another part of the forum and thought I'd post it here. The A.I. do the "come into pit and sit there forever" thing. On the timing screen their names turn blue since they're on pit late but then it never changes, they never go into the garage. Verified it with the ISI Meganes and the ISI Vettes. Similar to what was happening with the VirtualR LeMans. Tried re-downloading the track and reinstalling it but still same thing.
GT layout for clarification, International the AI pit just fine from what I've raced (all sorts of ISI cars).
