Black screen of death.
So, I'm new to this forum. If i posted this in the wrong place tell me.
My cousin has been trying, to no avail, to fix a hammer glitch. When we load the map, we get a black screen. We're uploading it to the Steam workshop from Hammer as either a VMX or a VMF, and neither works. So because of this, my cousin (Who shall henceforth be called, simply, Mint to avoid revealing ANYTHING) has a worthless map. Any help is appreciated.
Neither .vmf nor .vmx is what you need to play the map. That's just the file to edit the map in Hammer. To actually make it playable in Portal, you need to open the .vmf in Hammer and compile it to create a .bsp-file. That .bsp-file is also the one you'll upload to the workshop once you're happy with the map.
Hmm.... Okay. Mint compiled it. (Or so I'm told). But i was also told that another map that was uploaded was in vmf form.
No, that isn't possible for the Workshop. VPK should be, which would be map packs with lots of custom resources, but it isn't either.
You guys are awesome! 
I'll relay the info.
Okay, so I just found out, it worked fine before the Cave Johnson quote got disabled by Mint. Could attempting to disable it break the map?
Did you happen to delete the instance global_ents.vmf?
As long as we don't have the vmf it's just guessing 
No..... Mint says not. Anything else that might do it?