Recently, I've been having a lot of weird graphical glitches on my MacBook Pro. I get garbled text a lot, and when I drag Finder windows around, I get remnants of old window positions all over my desktop. Also, in Photoshop, I get all sorts of glitches. Dragging brushes around and such, random pieces of old layers and text appear all over my document. Here are couple screenshots to show you what I mean on some of these errors. Has anyone else experienced problems such as these? Could it be a bad graphics card, or something else?