With regards to corruptions. Unless there is some sort of bug with your install, or system set up, there is a simple soloution: ONLY save at the beginning of each turn before you move any pieces. Never save mid turn or at the end of a turn. I have not had ANY corruptions since I adopted this practice. I've played dozens of campaigns since then. I had plenty of corruptions before.

I know this sounds backwards, we all want to save those long series of moves we make, right? It's more efficient, right? That's what I thought too, but I noticed a pattern of corruptions when I did it that way.

I suspect that there are some interface bugs that creep in when you save late in a turn. The more stuff you have to move (late in a game), the more likely a corruption is. The end turn cleans up the short term problems/corruptions if there were no intermediate saves, but for some reason late turn saves seem to write some erroneous info that doesn't always clear.