Tools > OpenGL Redraw

Enables OpenGL redrawing of the screen when the window needs to be refreshed.

The Map3D display window must be refreshed every time a dialogue box is moved or removed. This refresh can either be done by saving the display window to a back buffer (this option is not checked), or by simply redrawing the screen (this option is checked).

This option should normally be checked, but can be disabled for problem graphics adaptors.