For some reason the mod won’t detect up to 1600x900 resolution? I’m stuck on 1152xsomething or other?
It also has a greyed out box for DirectX 9 when looking at the advanced options.
Any idea what the story is?
Greyed box is what it should be in Source engine. Make sure it lists DirectX v.9.x there in “Hardware Direct X version” and not 80/81. Read more on Source engine dxlevels in the sticky FAQ thread.
As for resolution - you could try adding “-width 1600 -height 900” to the startup parameters of the BMS and check if that helps.