Had the same issue with my 7900GTX recently, which is basically the same chip.
These "special effects" occured when I installed the recent 181.20 nvidia driver (thereīs already a newer one, but I didnīt test this one), after "downgrading" to 175.19 Forceware (which was installed before) the problem was gone.
I had also defective menu displays from time to time in both GTR2 and GTR Evo.
br
Michael
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