I am unable to reproduce a hang. On my first attempt I just loaded your save, did a modifier recalc when prompted to, and immediately ended the turn. On the next turn I selected the recommended building in each city that asked, and ended turn without moving any units. On the next turn I did the same again. After three turns it crashed with no minidump, which is a sure sign of running out of memory.
I then enabled viewports and loaded the save again. This time, after the modifier recalc, I set it on autoplay for 10 turns. It completed the 10 turns without any problems.
I therefore suspect that the root of your problems is that it is exhausting your memory (most likely video memory), since using viewports seemed to cure it for me. However, I never saw a hang as such (a crash instead), so I'm not total certain.
Try enabling viewports and see if that allows you to continue.
I allways have viewports enabled. But I downloaded the new SVN this afternoon and it working for me now. So whatever the problem is it been fixed ???? Guess it was just a very very minor blip.