Colorista uses OpenGL acceleration, so it's probably graphics related. Without knowing what card you have and what your settings are it will be impossible to advise, but of course look into the configuration, update the driver, work at a lower resolution and all the otehr usual first steps of tracking down the issues...
Thanks, Mylenium! I have Radeon X300/X550/X1050 Series Display Adapter.
Thanks, Mylenium! I have udate graphic card driver and all ok!