well I suspect I found a bug that grows over time. my most recent of games seems to have crash issues on extended exploration, rain, large scale building, and villager mass breading. OMG were did they all come from and howdid they all cram inside that one little building. ROFLMAO
. . staring village was fine even when building a castle near to the ceiling max. villagers seem to like the roof top of one building in particular. put just one door a few floors up and they go on a breeding frenzy.
located the ender catacombs, and a massive mine complex, practically under the original spawn point only minor crash issues from all that.
after exploring outward an extended distance I started getting crash issues, especially when raining.
located alternate village on a mountain side and built some there until it had a total crash failure issue.
I tried lowering the render distance to minimum and turned off ALL the extras to see if that helped, but it only lasted a few seconds and continued getting the crash problem.
I have attached the save file (without the 40 DBs) for your inspection so you know were things went haywire.
might just be an issue of memory crashing.
44 items in the DB folder including the attached (log, current, manifest)
I hope it helps make it better.
back to building castles and what ever else. hoping for more Redstone stuff soon.

{"controlType":1,"eventName":"GameSessionStart","eventTime":1449713462,"gameMode":"survival","gameSession":"a0fd7ef6232442f993a655f806dca60a","gameType":"local","isModded":false,"lefty":false,"productVersion":"v0.13.0 alpha","sessionId":"258961133de343b2a0ead70daa634d8d","skinId":"CityFolk_Baron","snooperVersion":1,"splitControls":true,"swapJump":false,"worldType":"Overworld"}