I just downloaded the 7/25 build of 2.5 dev running it on Vista & I'm having a few ctd desktop problems but can't fully replicate but error is along the lines of the attached from the last time I was able to catch something in the console.log
Also having crash to geoscapes on the +frozen mission in Russia shown on my save game attached at some point during one of the first couple of turns normally during the aliens part. I've tried playing this mission several times but haven't been able to get through it due to the crashes.
Also on the new wound system I've noticed that for some reason soldiers seem to get wounded for no reason during a mission ie after landing back at base they're in the hospital w/ very minor damage. I haven't got that one figured out yet as far as repeatability or causes.
Overall I like this version more than 2.4 as it seems like the Aliens are more of a challenge plus some of the other weapon changes.