i was running out of HD space. i thought... hmmm... i'm using BAIN for most things now, i don't need all these old .omod files. they're just compressed packages anyway, all the data in them is now safely in my "data" folder.
so... i deleted the .omod files.
which was fine. until i just opened OBMM to look inside a .bsa.... apparently it deleted all the info out of my data folder.
crap.