I was using NiK HDR 2 this evening. When I went into filmstrip mode to begin my import into NiK I began to see images like this:
http://www.flickr.com/photos/26351249@N07/8286868636/

I'm running a late 2009 iMac 2.8 i7 with 16GB of RAM so I know it's not a RAM issue. Could it be a video RAM issue? My graphics card is the Radeon HD 4850 512 MB. My only thing there is that I edit a lot of HD footage and haven't come across the problem….. yet.

I know the late 2009 iMacs are on the list for potential jacked up HDD, but when I entered my serial number into the website it said mine was good (allegedly). Any thoughts???