So I forgot to get a screenshot of it last night, but I came across a weird bug I haven't seen with Dual Sheathe before. I had an Iron Shield on my back (like its supposed to)......but I wouldn't draw it. The game acted like I had one equipped - extra armor, animations like I had one - I could even block, but the shield that was supposed to be on my arm was invisible while one remained on my back! I tried using the console to give myself a different kind of shield - equipping it didn't take the Iron Shield off my back (though it wasn't equipped anymore either) and the new shield was also invisible on my arm.

I made a new character to test and they worked just fine, so I'm not sure what was going on. Any ideas?

Did you try reloading from a previous save?

Did you try saving (a save meant for a seperate branch for testing this) and then reloading that save?