*Windows 7 64 bit
*minetest 0.4.11 MinGW 64 bit from the minetest downloads page as of a few days ago http://minetest.net/download
*mods used are home decor (version from a week or two ago), flatgen, worldedit 1.0, mapfix, startlocation
*Since I can't reproduce this bug, I didn't do the debug 4 thing, but I did find this looking through my debug.txt
15:26:19: ACTION[ServerThread]: scott places node stairs:slab_stone at (96,13,160)
15:26:19: ERROR[ServerThread]: WARNING: endSave() failed, map might not have saved.WARNING: saveBlock: Block failed to save (6,0,9): SQL logic error or missing database
15:26:19: ERROR[ServerThread]: WARNING: saveBlock: Block failed to save (6,0,10): SQL logic error or missing database
Also, I don't know if this is related or not, when I break a flat white light from the home decor mod the output from the DOS window stops outputting things but I don't get the error message.