I can use all other CS4 appz without worry, with the exception of Photoshop CS4.
I've posted a screen grab of my issue.
If anyone can help, or has advice, it would be very much appreciated.
This only happens at 100% zoom or less, if zoomed at 200% or greater, there is absolutely no issues.
I've checked the noise, and its not that because there's nothing on the layer.
PLEASE HELP.





