are the bullets getting deleted before you check for collision ? If so, that may be your problem. I can't really tell without your main game loop.
Space Invaders help
Blitz3D Forums/Blitz3D Beginners Area/Space Invaders helpThe forum is locked. These are the original blitzbasic.com forums, kept so they can still be read. No new topics, replies or edits can be made here. To join in, head over to the Blitz3D+ forums.