HostSB problems in FS9

Hi guys,I recently purchased FS9 and it's very impressive indeed, especially with addon's such as the PMDG 737. However, when i wish to fly online I encounter a problem. Once I have set-up multiplayer and joined the SBRelay session, it's time to run HostSB. It seems to approximately halve frame-rates when it is run. I tried this back on FS2002 and there is no performance hit at all. I have also tried going into windowed mode and the good performance returns, so it is only in full screen that the problem occurs. I have also noticed that menu loading (when you right click for example)is slow. Various graphics drivers have been tested (Radeon 9800 pro) Has anyone else experienced this?Many thanks,DavidSystem:Athlon 3000+1gb PC3200 RAMRadeon 9800 pro80gb 7200rpm HDD