If it helps at all, I'm on Windows 7 with my laptop screen as my primary monitor and an LCD screen to the left as my secondary.
I was initially in Win7's "enhanced graphics" mode (can't remember actual feature name) but when I tried to run the benchmark I was thrown into Basic mode. I had a fair amount of other applications running, though, so I may have just run out of memory.
Being thrown into Basic mode is unfortunately expected. I'll bet the reason it didn't work is having the secondary monitor on the left. I think I only tested it with the secondary monitor on the right.
I was initially in Win7's "enhanced graphics" mode (can't remember actual feature name) but when I tried to run the benchmark I was thrown into Basic mode. I had a fair amount of other applications running, though, so I may have just run out of memory.