Canvas/work area image gets stuck, doesn't show any changes made?

For some reason, if I minimize my Photoshop CS4 window for a few minutes and come back to it the canvas image I was working on is stuck for lack of better words. I change the zoom, doesn't do anything, although it shows at the top that I did in fact zoom to x%. Same for even using the brush to scribble, making layers invisible etc. Basically anything that changes what you see on the main canvas.
The only quickest way I have found to fix this is by dragging the tab of the project I'm working on out to show it in a window then dragging it back into the main working area again. This is clearly frustrating, has this happened to anyone else? Any idea of how to fix this? I couldn't find a single thing about this issue on Google.
The program itself doesn't even say not responding or anything at all, all menus open etc. so Photoshop itself isn't actually frozen, I'm baffled.
I'm running Photoshop CS4 (Extended) on Windows 7 32-bit Ultimate.

Sounds like you need a display driver update.
Go to the web site of the maker of your video card, and download and install their latest driver for your hardware.
That usually fixes this.
If it doesn't try disabling the OpenGL Drawing setting in Edit - Preferences - Performance.
-Noel

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