Users of these applications running their displays at 60 HZ might have noticed some performance problems.
And at 75HZ users might have noticed some frame tearing.
These issues seem to go away if the ATI display control panel is installed, and set to run in the configuration shown here.
Depending on what graphics card you are using, and the state of your os, you might also have to download and install the latest graphics drivers and/or firmware from ati
if you dont have a recent mac os - 10.3.6 or later- possibly.