I had this problem too. It happened when I updated the Nvidia display drivers from Nvidia's site, rather than Toshiba's website. When I completely removed the drivers and reinstalled the ones from Toshiba, the problem was fixed. Apparently a lot of other people have this problem (not limited to Toshiba laptops) as the problem is posted numerous times around the Internet. It definitely seems to be a driver problem. It's possible it was just that particular version of drivers I was originally using from Nvidia (rather than them being "unsupported" by Toshiba, per se), but either way, reverting to the older version fixed the problem. Uninstall the Nvidia Display Drivers, run a program called "DriverSweeper" and then reinstall the drivers.
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