I need to get to bed, so I'm going to keep this short for now.
My map just randomly started to make itself fullbright and many brushes. I can't find any issues (no leaks). Is there anything else that could cause this, or is Hammer just being Hammer?
I was playing a lobby on cp_process_rc(2? 3?) yesterday and about halfway through playerclip brushes were visible on the red side, but with the missing texture stand-in (purple and black checkerboards). It might have been one of the last two updates.
I'm opted into the sdk beta, using the most recent version, and when I compile a map I get the same issue as this. I think it's something with the beta compilers failing from that.
Do exactly as he says. When your done only use hammer.bat to do your editing save your map there. Then open up SDK in steam run hammer but don't edit the map only use this to compile the map, it works perfectly I have done it.
Just an fyi incase your worried. Changing Game Config under Steam SDK does not affect the Hammer.bat editor they are both separate.
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