Hi framed, it's Jo - the guy from the steam forum with the weird bug crashing savegames. I did a little more testing, and it seems like I have a combination of two problems: First, the game crashes more or less randomly, although more frequently the later I get into the game, and at some point I can't get past a certain turn. Usually somewhere between 50 - 100. I think it might be a problem with the barbarians, as the game mostly crashes in the barbarian turn. Not always, but it might be other civs running into barbarians if it isn't. Very rarely it's in my turn and truly random - I can reload, do the same thing again and don't crash. Plus I had one crash I could reproduce, where I moved my hero next to a barbarian wraith (btw - is it on purpose, wraiths don't have a unit model? Otherwise....

).
Second, I got random savegames breaking. I might get to a certain point in the game, decide to reload (doesn't matter if I had a crash or not), and some of the savegames (again, doesn't matter if its manual or auto saves) don't work. For example I might get to turn 60, try to reload, and the auto saves from turn 58,56 and say 52 are broken. The other's work. Then i load turn 54, get to turn 65 and crash. Reload, and all the savegames (I think it might even be including turn 54, but I couldn't reproduce that) don't work. Reload turn 54, and get to say turn 67 (got lucky there) - crash. Reload again, get to turn 57 - you can guess the rest. As a side note, of course I always activate the mods before loading.. ;-)
What I've tried so far: Different civs, difficulty levels, scenario or not, with and without underdark. All the troubleshooting, validating & reinstalling civ, manually installing the mods in different versions (I already did a first try with v15b too, same problem - although I might try a little more, see if I can further narrow the problem down). I even turned on db validation in the config.ini, tried turning on the logging and making sense of it, although I didn't get very far on that, yet. Oh yeah, as I mentioned different Hardware and OS - Win 7 and 10. I think I tried using the IGE once too, but didn't really know what I was looking for. Hmm... Should be it.
I've attached a few savegames - some that will break on the next turn and some that are just broken - I hope the file names are self-explanatory. I'd be very happy if you could have a look at them. If you need any more (saves or infos), just tell me.
On a side note: v15 looks great! You're really doing awesome work here..
