While driving last night, I hit F9 to see if my clutch was getting warm, and the game screen froze. The sounds buffer started looping whatever it was playing at the time. After about 5 seconds or so, a Vista message popped up saying "LFS.exe has stopped responding, looking for a fix" or whatever it does. All other hotkeys work perfectly fine, apart from F9 (tire and clutch temp). This was mid-race.

Spec is: AMD X2 4500, nVidia 8600GT, 2Gb RAM, Windows Vista Ultimate.

Do you have anything different (windows, some other progs) layed on f9? maybe thats stopping lfs.
Use f10 for clutch temp till the prob's solved.

Do you have FRAPS? I think F9 = FRAPS video capture... correct me if I'm wrong.

Quote from Nitrous13270 :

Do you have FRAPS? I think F9 = FRAPS video capture... correct me if I'm wrong.

That's the thought that I had as well.

Definitely check to see if you have Fraps open.

Has it ever done it before? If not then it is probably FRAPS..

Right chaps, you might have nailed it. In one move, I turned fraps off, and also ran LFS in XP SP2 compatibility mode. One of these corrected the issue, and I can now see my tire and clutch temps!

I'll turn XP compat. mode off tonight and report back with my findings. Cheers guys

Just for the record, it was Fraps that was killing it, as turning it back on killed the game again. Changed the Fraps hotkey, and all is good again. Cheers guys