Black screen of death.
Mint is having trouble with such things. So we'll have to wait :I
Does that have to do with the transition script maybe?
If you know something that would effect it let me know.
What style is the map?
Is it exported from the PTI?
Made from scratch. No Cave Johnson quote. Fully made in Hammer. And that's about all i know.
okay; assuming it's clean style:
Does your friend have:
instances/turbine_elevator/arrival_elevator_a4_base.vmf
instances/turbine_elevator/arrival_elevator_a4_logic.vmf
instances/global_ents.vmf
instances/transitions/arrival_departure_transition_ents.vmf as instances in his map?
Okay; you sent me the map.
The problem in your map is that there is only one light source; near the ceiling. It casts a bit of light; but it won't light your entire map. You will need to add more light sources in your map so you actually have a level that's visible.
Some other points:
- Don't build maps in a big box. That's a bad idea; it will increase compile time and reduce game performance; instead try to fix the leaks.
- The shake is too powerful and lasts too long.
Wow, that was fast 
Thanks man. I'll contact you if we have more problems.