This is not normal, but suggests an issue with the video card (or at least it's driver). What video card do you have? Do you have the latest drivers installed?
What Brett says and, please, provide details about your platform, exact version of the OS and hardware specs, as per the following link:
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Thanks for the response:
The Video Card Specs:
AMD Radeon HD 6750M Graphics processor with 1GB of GDDR5 memory and
Intel HD Graphics 300 with 384MB of DDR3 SDRAM shared with main memory
There is Automatic Graphic Switching between these two
The Software Details:
OSX 10.6 Snow Leopard
After doing research I am not sure if this issue is caused by:
1. upgrading the drivers of the graphics cards
2. upgrading photoshop to the 12.04 update
3. upgrading OSX snow Leopard to 10.6.5
I basically have to do this on multiple computers so I am trying to pinpoint the cause so that I don't cause stress or work delays for others.
Apple's support for multiple monitors is abysmal. The Mac hates it especially when you use two different cards that are not absolutely identical to each other. Can you try pulling out one card? Just noticed you're talking about laptops.
I have heard some people have had good results by essentially disabling the Intel GPU, which (this is second hand) I think is done by disabling the power-saving features.
Yes, definitely make sure you are only using your real video card (the Intel is the onboard chipset, very weak and prone to issues).