Game keeps freezing

Hey!
My game keeps freezing during the late industrial era after I end the turn, while playing the 15-civ Earth scenario. I'm using rev 1009, Wine 1.7.55 and Ubuntu 15.10.
Thanks!

Upload a save, or we can't help you.

I use Ubuntu 14.04, so I'll look at it for you.

But a quick fix might be to up the units per tile, I was having problems with 20 I think, I've upped it to 40 and never a problem now. Well rounded stacks and good game play

Thanks for the quick response!
It was a problem with units per tile indeed. The limit had been unset and I discovered some stacks of around 100 units, so after some deleting in the world builder and setting a limit of 40 the game works fine.