I actually had that problem quite often in the previous version, where the computer would hang when sending the email from within Civ. And it still happens to me in 1.61. It happens nearly every time I have to open up an advisor screen, or the tech tree, or event log? Anytime I do any of those things and then try to send the save from within Civ it would hang and I have to power off my computer. This happened to me with both 1.52 & still with 1.61. So this isn't something new for me, and it's really annoying.