Graphical Cursor Bug

BlitzPlus Forums/BlitzPlus Programming/Graphical Cursor Bug

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Right, I made a custom cursor for use in my game. But during the game this bug happens:

The mouse cursor image pastes itself onto certain parts of the background image (which is refreshed each frame)
All the graphics are in png format and the game is in fullscreen mode. You'll see it only happens on the black outlines of the background.

Any ideas?