Possible bug with GT520 video card

I recently moved that card from my fast overclocked machine to my stable one because I was getting computational errors on all the s6 gravitational Wu's the error followed the card. The video card works great for seti and milkyway@home and it passes all memory and stress testing without a hickup so i have to wonder if it is in your code somehow. It is a geforce GT520 PCI express 2.0 with 2gb of ddr3 memory running at standard settings. Could the 2gb be a problem? It is the only video card i have with over a gig of memory and it is the only one i have had a problem with running the s6 stuff.

for the moment i just turned off the use nvidia setting so i can get some work instead of maxing out my allotment on junk errors.