I just installed the L4D SDK today, and for some reason, Hammer does not want to start. It works in the regular SDK, but not in the L4D one.
I already reinstalled it once, too.
Thanks for helping!
I heard it takes like 5 minutes to load.
I don’t own l4d so I wouldn’t know anything else about it. Have you tried waiting 5-10 minutes?
No, haha I was being impatient I guess… lemme try it again and I’ll post back.
Alright.
Yeah, turns out you were right haha, only took about 2 1/2 mins xD
The reason I thought it didn’t work was because it kept saying “not responding”, so I usually just closed it. Thanks again! 
Haha no problem.
Quote from developer.valvesoftware:
Patience my friend…