Collisions problem

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Dock

I'm currently following the Blitz3D tutorials by Ray Diaz (excellent stuff so far ^^). However, I'm having a strange problem with collisions.

I'm finding that if I enable the line:
"Collisions PLAYER,PROPS,2,1"
It actually makes all my PROPS disappear!

It works perfectly fine with:
"Collisions PLAYER,PROPS,1,1", but this is of course not what I want. I looked through the sample source code and I can't figure out what it could be which is stopping my version from working properly.

any ideas?