This sounds like an old problem that happened with nvidia drivers at some point around blitz3d release 1.85-1.89. There are a few references to it here:
http://www.blitzbasic.com/Community/posts.php?topic=42890
In particular here is a bug report with pictures:
http://www.blitzbasic.com/Community/posts.php?topic=41001
What version of blitz3d are you using?
I am using 1.90 and have not had any problems on the various computers I have tried my software on. I mainly use a 'master' entity which I create copies and free those copies many times during the game.
http://www.blitzbasic.com/Community/posts.php?topic=42890
In particular here is a bug report with pictures:
http://www.blitzbasic.com/Community/posts.php?topic=41001
What version of blitz3d are you using?
I am using 1.90 and have not had any problems on the various computers I have tried my software on. I mainly use a 'master' entity which I create copies and free those copies many times during the game.