This happens sometimes. Even though you've installed the 32bit drivers as well, they aren't recognized. When this anomaly occurs, I press Ctrl+Alt+F1 and stop Gnome (gdm). Then install your drivers again (via sudo or switch to root, either way). Once they're installed, I start gdm again and reboot my machine. Basically, just reinstall the drivers again. :) Hope this helps. r2rX :D
