OK, I think I've found a more stable build, I'm now uploading it, which will take about 5-6 hours from now.
For those of you who have SVN checkout copies, I'd recommend revision 19141 - I ran it on two machines and can't find anything that makes it crash outright, although it does have a few minor cosmetic issues here and there at high display resolutions, but nothing that really makes the game unplayable. Regarding the minor issues, I found them on a machine with old video card drivers, which could very well be the culprit, if I notice them again on one of my newer machines and it seems like it's the game instead, I'll post something for support with details in another thread or the tracker (sourceforge).
BTW, 19141 completely compiles under windows_debug, including radiant, and in the battlescape the fps stays rather high, not dropping or getting choppy like in past builds (at least on my machines).