Display Problems:

Problem:

When dragging entities around, a strange "ghost" image appears or else there are funny lines on the screen.
This problem is caused by incorrectly written display driver software for certain graphics cards

Solution 1

1) Select Start > Settings > Control Panel
2) Select Display > Settings > Advanced Properties
3) Select Performance. Turn the Hardware Acceleration slider bar down to None.

You may need to restart Windows.

CM should now work fine. Try increasing the Hardware Acceleration slightly.

Solution 2

Download the latest display driver software from your display manufacturer's web site.