Haven't had that one Mozman, but just a thought. Have you tried different graphic settings in your RichardBurnsRally.ini file? Here is mine for reference...
Depth = 32
ForceFeedback = true
Fullscreen = true
MinDepthBits = 24
MinStencilBits = 8
ParticleQuality = low
RenderCarShadow = true
RenderQuality = high
RunIntro = false
RunStartup = false
Sound = true
UseCubicEnvironmentMaps = true
UseEAX = true
UseSoftwareAudio = false
UseTripleScreenBuffers = false
WaitRetrace = false
XRes = 1680
YRes = 1050
FYI, I just noticed that the screenshots aren't coming through. Will investigate.