Can't see multiple spaces from mission control
I have six spaces open, but when I enter mission control, I don't see the 6 windows up top; they are invisible. If I click in the general location I'll get to the space, but I can't see any images of the six spaces which are peppered with apps. Its blank up top. Need a fix. Thanks
Aluminum iMac 20 inch, Mac OS X (10.6.5), 4 gigs RAM 2.66 Ghz