As stated in another post, currently most ATI/AMD Raedon 7xxx cards have this issue especially (7770s). It is a driver issue with ATI not an ingame bug. You can either wait for a new driver or use a Raedon 5xxx or 6xxx series or Nvidia 4xx or 5xx series cards.

The person with the 560TI I suggest double checking your drivers as I have the same card with the current drivers working flawlessly.