i have been experiencing the same problem, it always seemed to happen as soon as i shut down or sign out of Parallels.
MacBook Pro
15" Mid 2010
2,66 GHz Intel Core i7
4GB 1067 MHz DDR3
Intel HD Graphics 288MB
OS X 10.9 (13A598)
My friend this morning suggested that i download a app that forces the Macbook to use the NVIDIA GeForce GT 330M graphics card. Apparently these macbooks come with 2 graphics cards, a Intel one and the NVIDIA one and then depending on which application you are running the MacBook will decide which graphics card to use.
i installed the little app and then on the top taskbar you will notice an "i" being displayed.. click on it.. you will notice that the current setting will be on "Dynamic Switching".... Click on "Discrete Only".. this will force the macbook to use the NVIDIA card.. this seems to have solved my problem with the graphic glitches for now
here's the link to the software... gfxCardStatus by Cody Krieger
http://gfx.io
please let me know if this fixes the problem for anyone else out there