The solution for this problem is the "Graphics Calibration Fix" by Frank
Triggs, it is written for Nvidia cards with detonator drivers.
For other cards:
Copy Gp3gc.exe to Grand Prix 3 directory, run Gp3gc.exe and click start, patch will begin. Done. Run Gp3.exe.
A backup of Gp3.exe will be created called Gp3.exe.bak.
Problems?
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If you run into problems delete gconfig.txt, cards.txt, f1gstate.sav, restart windows and run patched Gp3.exe again. You`ll be told that the screen resolution selected hasn`t been calibrated, click yes and it will calibrate your graphics from the highest resolution available first. When its finished quit and save changes. You`ll never be asked to calibrate your graphics again when you load GP3!...
(except when you change screen resolution it will test it)...
Happy racing from Germany !!!