objects going through floor when thrown

Yesterday I placed some overlays, put in my env_cubemaps (2) and compiled the map. While running it, I typed in "buildcubemaps" as usual. Then I started playing around with the level. I threw some grenades and what not and they just fell through the floor and went through the walls when thrown. Anyone ever heard of this or have a possible solution? Could the overlays/cubemap be related to the problem? Thanks! :smile:

Buildcubemaps is apparently still a bit buggy, so it might be that?

Did it only happen while you were playing immediately after running buildcubemaps? i.e. does it still happen now, after a steam restart?

Also, make sure your cubemaps are at least 16 units from all walls/floors, it could be an error related to that....

Overlays on top of the floor using the overlay tool? Or used the overlays as textures?

Ok, obvious question, do the grenades etc. fall through the floor before you run buildcubemaps? And what do the overlays have to do with it, how are they related to this problem do you think?