What are you doing? In Hammer, open your map vmf. Hit F9, or this,
, or go to File -> Run Map. Make sure you have vrad and vvis on Fast and BSP on Normal. Don't do HDR. It should be fine.
If your map isn't even generating a BSP before moving onto lighting, you have a problem. Usually my issue is an invalid solid. Hit Alt+P and look for errors.
I've searched for problems, and there's a big list of them, except I don't see what half of them mean:
Entity (trigger_capture_area) had bad I/O connections
Entity (trigger_capture_area) had bad I/O connections
Entity (trigger_multiple) has bad I/O connections
Entity keyvalue "controlpoint" refers to a missing target
Entity keyvalue "controlpoint" refers to a missing target
Entity keyvalue "controlpoint" refers to a missing target
Entity keyvalue "controlpoint" refers to a missing target
Entity keyvalue "controlpoint" refers to a missing target
Entity keyvalue "controlpoint" refers to a missing target
Entity keyvalue "controlpoint" refers to a missing target
Entity keyvalue "controlpoint" refers to a missing target
Entity keyvalue "controlpoint" refers to a missing target
Entity keyvalue "controlpoint" refers to a missing target
Entity keyvalue "controlpoint" refers to a missing target
Entity keyvalue "controlpoint" refers to a missing target
Entity keyvalue "controlpoint" refers to a missing target
Entity keyvalue "controlpoint" refers to a missing target
Entity keyvalue "controlpoint" refers to a missing target
Entity keyvalue "controlpoint" refers to a missing target
Overlay with no assigned faces
There is no player start - Odd, because I have both RED and BLU spawns