Hey, I managed to have a total game freeze when fighting the... super secret encounter in the Sea of Serpents. No big deal, probably a Java RAM issue. However, when reloading my save I made just before the battle, I encountered an error that prevented loading; the game was calling an invalid class. This error was apparently caused by Nexerelin; turning off (and later on again) the experimental strategic AI fixed the issue! Sadly I didn't think to save a copy of the log, to check exactly what was causing the error; thought I'd give a shoutout regardless, in case anyone else runs into the same problem.