Dreamcast: Ooga Booga on NullDC r150

Hey everybody,

I have a little Problem. I played the whole solo campagne of the Dreamcastgame "Ooga Booga" through (Tribal Trial Challenge) on the NullDC emulator without any problems. Graphics are smooth, sound is great and the funfactor is over 9000. I played with the full 1,1GB-GDI-IMAGE of the game on the NullDC r150. Now here is the problem: When I try to play a VS-Match (Offline Skirmish) the emulator doesnt work anymore. What can I do? What parameters must I configurate?