Your job works OK for me also. Have you updated your graphics card drivers?
Another thing is I am running XP instead of 7, maybe that is the difference.
I have been having memory issues ever since I setup Windows 7 64bit on my computer. I am regularly (at least once a day) running out of memory with 6G of RAM installed. Either Windows 7 has problems, or the applications I am running are having problems dealing with Windows 7. It appears to be some sort of a memory leak issue. Besides eCabs I seem to have problems with Firefox and Thunderbird.