Ran into a rather strange problem it would seem.
Tried to do some work on my realm engine, and it crashed outright after i built it, so i thought maybe some of the changes i did was at fault but even after reverting it still crashes.
So i tried to build tomazquake 148 from an unmodified source, and it also crashes Oo in fact all older quake engines crash outright, and so far the only ones i could get running where quakespasm darkplaces and FTE.
Seems the older sources have some nasties that no longer fly though im a bit baffled as to which windows update changed things this much.