Static in FCG

[cmalamed]

I installed the FCG and ran through your great instructional video and everything was working fine until yesterday, the FCG images and surrounding area suddenly started displaying what I can only call "static." There are red, green, and blue lines running through the entire top portion of the site, particularly in the FCG photos. I'm using a one-year old iMac and StudioPress Church theme and am not having problems on any other sites or with my monitor. Has anyone had this issue and solved it? Thanks.