I've seen this only twice so not sure of the exact conditions that trigger it.

However, both times Madora has been equipping an item she was too low level for, but it was so awesome I wanted to use it anyway. Both times they were two-handed weapons.

I couldn't equip it. Or anything else. If I unequipped the current item, I still couldn't equip anything else. Save and reload didn't help, but save, quit, restart, load did.

Is this a bug? Am I somehow doing something wrong?