I have downloaded and tried your save. It works fine in the latest version for me (took about 10 seconds), so whatever caused it has probably been fixed. Given V33 is released this weekend (you should upgrade when it is), it's probably not worth chasing down unless it persists for you after you upgrade (hopefully it won't!). If it does then I can build a special version that will generate extra logs and stuff, which you can run and will hopefully enable us to pin down the cause (might take a few iterations with more and more specific logging added, so that's why it's not worth investing the effort now, until we know V33 still shows the problem for you).
Important note - in the absence of more specific instructions I just loaded the save and hit end turn, verifying that the turn completed ok, and arrived at the next turn. Can you check that just doing that is all that is needed to reproduce the hang for you. If i is not, what specific actions (from the save you posted) do I need to take?