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You're calling the wrong function.

Call once to DisableGlobalPlayerCollision() when you have libcod
Then setcontents(256) on spawn.
setcontents(257) for a moment if you need bullettrace (that...

Just try with setcontents(256) every frame on every player...

Where did i ever write that?

I just asked if you could try on 1.2/1.3 so the 1.0 factor is not a concern.

can you try on 1.3/1.2?

do you call setcontents(0); on every player every serverframe?

Might also do with setcontents(256);, as that bit seems to set collision to moving brushes (useful)