Display corruption may be seen in Windows 7 while using Magnifier if the display has been rotated.

Applies to: Windows 7 EnterpriseWindows 7 Home BasicWindows 7 Home Premium More

Summary

While using the Magnifier accessibility tool, you may experience display corruption if you have enabled the color inversion option and have rotated the display 90° or more. This may be particularly noticeable on Tablet PCs as screen rotation is more commonly needed.

No workaround is available at this time. It is recommended that if possible, the display remains in its standard position or the color inversion option remains disabled.

More Information

By following these steps you will likely reproduce this issue:
  1. Run Magnifier
  2. Click Options
  3. Enable "Turn on color inversion"
  4. Rotate the screen 90° or more.