Now running many games on MW3h trying to track down the crash on linux. At this point, it appears that it *might* be associated with a dwarf death (but not other creatures) - many such hangs occur in early Spring when nasties are about, but not when they have time. I can successfully run a game after having removed all the dfhack plugins ... so far. Investigation continues.
Current unpack on linux is original DF, then dfhack, then MW:
mkdir -p MW3h/Dwarf\ Fortress
cd MW3h/Dwarf\ Fortress
tar --strip-components 1 -xjkf ../../df_34_11_linux.tar.bz2 --exclude raw
tar xkzf ../../dfhack-0.34.11-r3-Linux.tar.gz
cd ..
unrar x -o+ ../MasterworkDF\ v3h.rar
(other normal setup steps)