Hi Alex,

That's very likely an issue with Revit not playing nicely with your video card, OR your video card is running out of memory.

Can you please post the specs for your computer:
Version of Windows?
Amount of RAM?
Video card and amount of memory on the video card?
Video card driver?

Has this been happening as long as you can remember, or did it just start? Did you (or someone you know ) recently update the video card drivers?

Do you have DPI scaling on? (e.g. 125% DPI settings to make everything look a little bigger and easier on the eyes).

Troubleshooting:
Turn off hardware accelleration (Direct3D) in all the versions of Revit you have running.
If you've modified the DPI setting, change it back to 100% (the default).

I have posted the full report from dxdiag.

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System Information
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Operating System: Windows XP Professional x64 Edition (5.2, Build 3790) Service Pack 2 (3790.srv03_sp2_qfe.100216-1301)
Processor: Intel(R) Pentium(R) Xeon processor (4 CPUs), ~2.7GHz
Memory: 6126MB RAM
Page File: 1631MB used, 6153MB available
DirectX Version: DirectX 9.0c (4.09.0000.0904)
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Display Devices
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Card name: NVIDIA Quadro FX 1800
Display Memory: 768.0 MB
Driver Version: 6.14.0011.9703 (English)