Wondering if that bug with followers getting overencumbered by respawning their invisible inventory items each time you ask them to follow you is still present or whether it's been fixed yet. I have a follower right now following me around and I'm paranoid about telling her to wait anywhere.
Also a possible fix: since Wabbajack apparently does a hard reset on your character and fixes the level stat bug(?) does it also reset inventory? (I don't have the wabbajack yet)
The Unofficial Skyrim Patch fixes this. I pulled eight bows from Lydia after patching. I still get some errors with showinventory but it's not showing everything that I have given her. I also level her up. That is where the extra bows come from. Level up, adds a bow. Not sure if this is a complete fix, but I think so.
I'm not surprised that the unofficial patch fixes this problem, I was hoping there would be an official patch since I play on the 360. I'm asking here because nobody on the 360 forums knows or cares about this kind of issue, most of them are crying about graphics.