While playing Version 0.5.2b (using the default OpenXCOM Extended 3.5+), I've encountered a crash which happens near the end of the month (when the clock approaches midnight). The save file in question is attached.
No mods except "X-Com Files" have been used.
UPDATED: I also provide the log file.
There has also been a strange glitch on the Durathread Factory Map (the one in the polar region, I think), where units outside buildings seemed not to spend TU while moving around. And there were also freezes during the Enemy Movement screen. Unfortunately I cannot provide any savefiles for that.