I have a Macbook and heres what happens.. I downloaded and install adobe CS5, After Effects Illustrator Bridge Contribute Dreamweaver Flash Catalyst Flash Pro InDesign Premiere Pro Photoshop and now my screen does this every once in a while and if i log out and log back in it goes away.. My specs: Processor: 2.4 GHz Intel Core 2 Duo Memory: 2 GB 667 MHz DDR2 SDRAM Snow Leopard 10.6.3 I have 90.75 GB left on HDD Anyone else have this problem? It does this every once in a while, Mainly after i use Adobe Products could it be cause it uses x64 bit? and after a while when the program is closed it messes with the GFX card? Well, im going to try and not run the programs listed above and see if it happens..