Strange... Not sure what I can do about that. Its quite an interesting problem though

Do the dots stay in the same place all the time?
Its a bit hard to tell, but it looks like the dots only occur in rendered textures - so scenes that don't use any information from the previous scene (like some tunnels, the space harrier, rain, cube-based stuff) should be fine but others that do (anything thats blurred or repeats a lot - like metafire) should have the dots. Let me know if thats right.
Another way to tell is to turn on an overlay that uses textures - like overlay Mirror, and see if that has dots.
And do other scenes have the same problem?
- Gordon