Weird. The files I have downloaded from IfcaSims were package files already, so I didn't have to convert them.
What do you use to convert sims3pack files? I use Delphy's Multi-Extracter. http://modthesims.info/d/364038/delphy-s-sims-3-pack-multi-extracter-updated-5th-sept-2009.html
It's a unqualified guess, but maybe you somehow converted DBPF (Database Packed Files) packages into non-DBPF ones, so some code got lost for the game and Dashboard to read. *scratches chin*
Did you download the hairs from IfcaSims directly, one by one, or some sims3packs with several hairs in each sims3pack? The single hair files should be packages already, and that's how I downloaded mine. https://ifcasims.tumblr.com/
