Richard burns rally scenery disappearing

Hi all
I've updated RBR to the most recent official patch, but this problem is still happening.

The stage starts off fine, no problems at all. Then, about mid-way through, or possibly earlier, most if not all of the scenery disappears, and the only way I can can it back is by restarting the entire game from the desktop. I can drive the stage fine, just all the peripheral scenery is absent.

Is this a documented problem? If so is there anything I can do about it?

Thanks