Graphics bug scorescreen 3-player

Hi STK-Developers,
some days ago I had the pleasure to play STK at 3 players on my Macbook pro late 07 (Geforce 8600m) using three keyboards (internal + 2 USB external). I noticed that during the score screens, there were often (always?) bugs covering big parts of the screen. I made 2 screenshots and attached them to show the bugs to you. The bugs are not that annoying because they are only in the score screens, but they look bad and are maybe even easy to fix.
If you want me to, I can do more tests for you, maybe also on other machines (Mac Pro X1900XT, G5 Radeon 9800pro). But maybe you can give me some hints what directions I should test, because it's a little effort to configure the 3 keyboards and complete races. Maybe I should try 4 keyboards? Does the keyboard count even play a role or could I just use one with up to 4 different key settings? Maybe try other graphic settings (is set to FX level 5, no post processing, resolution 1680x1050 fullscreen - native would be 1920x1200)?
I'm looking forward to your answer and to helping you find the problem!
Waldbaer
some days ago I had the pleasure to play STK at 3 players on my Macbook pro late 07 (Geforce 8600m) using three keyboards (internal + 2 USB external). I noticed that during the score screens, there were often (always?) bugs covering big parts of the screen. I made 2 screenshots and attached them to show the bugs to you. The bugs are not that annoying because they are only in the score screens, but they look bad and are maybe even easy to fix.
If you want me to, I can do more tests for you, maybe also on other machines (Mac Pro X1900XT, G5 Radeon 9800pro). But maybe you can give me some hints what directions I should test, because it's a little effort to configure the 3 keyboards and complete races. Maybe I should try 4 keyboards? Does the keyboard count even play a role or could I just use one with up to 4 different key settings? Maybe try other graphic settings (is set to FX level 5, no post processing, resolution 1680x1050 fullscreen - native would be 1920x1200)?
I'm looking forward to your answer and to helping you find the problem!
Waldbaer