Hi. I have similar problem. Only my problem is, that item does not comes up in multisell. it appears as black box with name "none" on it.
I've tries edit etcitemgrp.dat, but looks like its not in there, becouse after changing my item to adena settings, its still invisible.
in inventory its fine, on ground its fine. equiped its fine (for some shields). But in multisell - its empty black box with "none".
any help? what file does controls that?