I have searched on the Forums and via Google without finding any similar problem described.

In World Editor, after adding any script via Map Properties, a significant number (12 or so) of the Dell Optiplex PCs I have tried or then display a blank black window when running the level. I have found the identical situation with downloaded sample/tutorial projects. 'Run Level' produces a black window. removing the script in Map Properties produces a viewable level. This has also happened once on a non-Dell with a much better graphics card.

There are no error messages appearing, either on the build or on running the level.

Every system I have tried has been running Windows XP Pro with Service Pack 3.

What am I missing? What could I try, or where should I look for previous discussions of this issue? Thank you.