Is anyone having trouble with the latest NVidia drivers? As I posted before, I was getting regular crashes using the older drivers on Windows 8, and now that I've upgraded I no longer get these. However I do get some 'empty' tasks opening up (see pic). One of these appears every few hours, and doesn't seem to have an effect on performance. The screen grab was from it being left on overnight. If I hover over one, it doesn't have any content, and when I click on one of them, they all close down.
Any thoughts? I don't even know what to google for
quick edit, I should say that this may have nothing to do with drivers, but didn't think it deserved a thread of its own. Also included what it looks like when I hover over it.
Typical, its overwritten the original picture I uploaded with the new one instead of putting it alongside

For everyone that missed it, I sometimes have my entire taskbar filled with those boxes if I've left my computer on overnight.