Tried your save, did the recalc and used AI autoplay for 50 turns, after that I messed around with the interface for a while and moved the camera fast around, I also played three turns manually without minimize AI turns and quick combat + show enemy moves. As I though perhaps having the camera move around while AI is doing their turn could be a factor that the graphical paging system didn't cope well with.Interesting. I'm also having a MAF, I'm playing on the Ultimate Earth Map and SVN updated earlier this week. Now I know that the UEM is just a massive map that had MAF issues before around late medieval era, but I'm currently barely at the ancient era and I'm getting a very consistent MAF error. I recall playing larger size savegames, and later era games, without any MAF issues on this same machine, so something feels off software side. I've tried deleting the cache and updating SVN, also patched the BTS exe to use 4GB RAM, but that didn't help; recalculating gives a MAF error too.
I had no MAF's for those 53 turns. RAM usage went between 1.8 to 2.2 GB and VRAM usage was quite steady at 1.8 GB.
Are you on a laptop? How much VRAM do you have?