Spring RTS Engine

When I try to play a game the "Finalizing..." screen takes about 3 minutes. Eventually the map appears but it seems to just hog the CPU at 100% and do nothing. I waited for 15 minutes and gave up. Also there is a message saying "FBO not ready5" when the map appears.

Tried it in Linux instead - works fine. No sound though. Got owned by the AI in 10 minutes.