L4D2 Authoring tool I need help!

[Chibibar]

I am new to 3D stuff but I have tons of ideas for maps. I have some issues.

If you have L4D2 (or 1) you can access the authoring tool which allows you to make maps and campaign. I am having some basic issues I can't figure out. I have been testing the map to make sure my lighting and stuff works properly (pressing f9 in the hammer authoring tool)

I notice something that is "mess up"

lighting - for some reason, my lights bleeds into the next room via the ceiling and floor. I made sure the adjacent wall is overlapping the ceiling AND floor (i.e. it sticks out in the outside world, but since you are in a bunker, you can't never see them) so I am not sure why is it bleeding. It is kinda weird.

Two, I notice that my furnitures has vanish.

I hope someone can help me.

Thanks.

 

[AshburnerX]

The furniture thing might just be related to your video card. I know some of the official maps (namely the first and last Hard Rain maps) that sometimes things don't show up on your monitor but are still there. You can jump up on them and climb on top of them, even if you can't see them. It's weird.