I couldn't find all my villagers.  I had raised several to Master status, and now they're gone.  I'd already walled off the village, slept in a bed every night to avoid them getting killed by monsters, and I've kept the bed count well below 20 to avoid random destructive events.  I have the same number of villagers, but I have some level 1 villagers that I didn't have before.  It seems that Master-level villagers are changing professions and ruining all the hard work I put into raising them to maximum level.  This needs to stop.  Once I start leveling up villagers, they should not change professions, otherwise, why level them up?

Also, I was having problems with some of my villagers not showing up at all - is there a maximum number of villagers that the game can handle at one time?  If so, that needs to be removed, or a toggle control built into the preferences page.  I've got 32 GB of RAM, I can handle the overhead.