Still need to know

[JavaGuy]

When I get one of those sv_setbrush null errors when my map loads, is there any quick way to find the offending brush?

[Joben]

I would imagine there would also be an error message when it is compiling.

keep and eye on it and note the brush's number. You can search for it in Radiant, its under misc i think.

[JavaGuy]

Nope, no error message. It compiles okay but crashes when the map loads in-game.

 

A follow-up: I can load the map as a multiplayer and duel against bots (it's not really made for that, but the point is it works with no null-brush error).