The path arrows work fine. The bots just ignore the func_nav_avoids which, from all I can tell, is juts a problem in their AI, and I've not been able to fix it.
I've had that problem too and just needed to make the brushes bigger.
And I've just tested it again: there is at least one path where no arrows are visible.
Fixed the broken tanks, I'm almost sure.
Also fixed a few broken clippings, some zfightings and somehow managed to rebreak the lighting on the leaves again. Sigh.
Also, the nav and pop file are packed in this time.