I need a cube dropper large multiple cause if i make it normal it messes with all the other cube and sphere droppers on my map the other ones are multiple

Also i have made a catwalk that i fall through

copy everything from the instance cube_Dropper_shared is using and paste it in the cube_dropper_lasrge_multiple.

drewdinie wrote:
Also i have made a catwalk that i fall through

Don't use the LOD versions. If the model name ends in _lod1 or _lod2, do NOT use it in playable area. These versions of catwalks are meant for background detail (far LODs are much less high-res and use much less memory) and thus will not have player collision.

If that's not the problem, open your properties and under Collisions, select Use VPhysics.

And if THAT doesn't work, drag a brush around the catwalk and use the player_clip texture...

I found the problem in the instance you sent.
you have a func_instance_io_proxy called proxy which has as output onproxyrelay @cubedropper; trigger and onproxyrelay; @cube_dropper_autorespawn; enable. You need to remove the @-things too.

About the catwalks: as kaleido said; make sure you don't use the lod models.
General tip for models make sure they have a collision model:

The red lines are the collision models; telling objects where they can't go. No collision model = non-solid object!