YES! I'm so happy someone else is having this problem.
I've tried changing the grid display, as mentioned above, but it doesn't help. I thought I might add that this is a new problem in our office, it only started happening when we upgraded one of our macs (now use a new iMac running OS X 10.5), but VW 11.5 was running just fine on our older mac minis that have OS X 10.4.
This background pattern makes it basically impossible to draft, unless we switch to the black background option, which we'd rather not do. I think it's a serious bug that needs to be adressed.