I am also having problems with the latest 13.4 Catalyst Drivers.
Before I installed them, my games worked fine, now, the games are flickering and not in-sync with the monitor or is just having problems in general.
The only thing I changed was the Catalyst drivers.
My last set of drivers were 12.10, I think... but they were in the 12th version.
ATI 5970 (no overclocking)
Current version: 13.4
Previous version: 12.10 (maybe 12.11)
Windows 7 64 bit
latest updates installed.
Problems: While playing Sid Meier's Pirates! and Crysis 2, once the game begins, the screen flickers and it looks like it's out of sync.
Mobo: Asus P6X58D Premium
2 displays, but the games play on: LG E2350
CPU: i7 980X (not over-clocked)
12 GB Patriot memory