I'm back, but it'll take me a day to catch up. One thing I saw though:

>> A few more things I should mention:
>> 
>> When running the snapshot kernel, I've gotten a few
>> 	panic: pmap_enter_ptpage: PT page not entered 
>> 
>> panics.   The machine locks up solid after these (though it does claim
>> to be syncing its disks, it needs to have its halt button pressed).  
>

I've seen this. I think I got this when I made MAXUSERS > 20.