I came across this disturbing problem. I have Mjoll the Lioness as a follower, and I wanted to trade some things with her. I go to the "I want to trade a few things with you" dialog, and she responds "I can carry a good bit of gear", but the inventory doesn't show up at all.
I try the console command "openactorcontainer" but still her container won't show up. I can trade with other followers and the console command works on them but not to Mjoll.
How can I make her inventory show up??