Bullets keep leaving traces on background!

[gum]

When I shoot bullets they keep stick into the background in certain areas. The actual bullet objects continue as they should, but it looks like they freeze midway. If I scroll away from the area and then return they dissapear.
This bug appeared when I remade all my graphics into pure black and white (not grayscale). Why does MMF behave like this, and what can I do?

[Nick]

I think you need to upload an example so people can see exactly whats going on.

[LazyCoder]

Are you using the 'Paste into background' action? Are your bullets active objects? You really need to give more information, such as how you are doing things like making the bullets move, etc.

[thewreck]

Accually, this problem is very common in scrolling games. If an object has the "inactivate if too far from window" on automatic, mmf fails to update the graphics correctly when the object is moved from within the visible area to a point outside where it would trigger the inactivation. The quick fix to this is to just disable inactivation if too far from window.

[00J]

So you've resolved your issue then? Cool. That could answer a lot of problems.