HLMV unable to load
After applying this config, when trying to use HLMV (Half-Life Model Viewer) it is no longer able to load. Troubleshooting revealed the cause to be dxsupport_overrides.cfg setting DefaultRes to 2560 as removing that line alone resolved the issue. There's probably a maximum it can support, but I didn't investigate any further to determine that.
Hm, I don't seem to have this issue, out of curiosity, what is your monitor resolution?
1920x1080, though I run the game itself at 2560x1440 all the time
I'm also on 1080p, although i do run the game at native resolution. I kind of doubt it is that, sort of was just throwing out a vague guess in case it was related
OP, does this still happen?
As a workaround, you can just not use mastercomfig when using HLMV, as it is not intended for it directly. In the past, I had used HLMV without any problems with mastercomfig applied.