Kelli Chiung

I have this problem with all post mesh viewers. DOesnt matter which yet i can load an pre mesh viewer i like firestorm and i have no choppiness at all. Everything is smooth. Pcs are both i7s graphics on 1 is a gtx480 and the other a 560 so graphics and cpu are fine. 12 gigs ram on both so its not my pcs. ANd the fact that i can run pre mesh firestorm fine tells me its a problem in the new viewers. Any help or idea to allow me to run a mesh viewer would be very much appreciated.