PTI maps exported with puzzlemaker_export broken
Cave not talking might as well be because you ran out of quotes and have to reset them to hear them again. I don't know about the graphic problem though. Do you have a link to the workshop file?
This is the command to reset them: cm_reset_vo_progress
I just tried that, but maybe I did something wrong: I didn't hear a quote. I guess you mean the black floor tiles that are usually of a more yellow/brown color? No idea why they look different here if you didn't change anything.
Yes, I do mean the brown/yellow floor tiles.
For those interested, here's a VMF and pre-compiled BSP of the map.
The blacked out sections are probably because you didn't do a final compile. At least, that's what fixed it for me.
[spoiler]WOM Test 1
Laser Cube Quest
Mho' Power - Community Spotlight!
Four Corners[/spoiler]
I'm having a brain fart. What do you mean by "final compile"? Is it something different than compiling normally?
Yes, it takes a bit longer and it will look better. To do so go press F9, go to expert mode and select full compile both -final (not sure about the phrasing). It takes longer but it'll look better!
You still had the problem that the Cave Johnson quote isn't working, right? LP pointed out what was wrong on my map with the same issue. Find the global_pti_ent and check it's properties. There should be an option "disable_pti_audio". Set this to 1 and he's talking again. I know it sounds more reasonable to pick 0, but it really is 1. 
Oh, apparently this has a side issue: The Cave line plays again when an autosave is loaded later in the map. I guess I will collapse the pti stuff completely and just play a fixed quote instead in the beginning.