I've recently discovered while reading the wiki that the player is always unable to equip forged daedric boots made at the atronach forge! I was so annoyed. All I have right now is the Daedric Helm, gauntlets and armour with 2 Daedric blades.
I managed to scavange a load of rare forge items and have been forging whatever I can for quite a while now. I really hope this bug gets fixed!
Basically, you can summon the boots, but when you go to pick them up, they won't appear in your inventory under apparel! Lucky I saved before forging them! If anybody else has had this issue, post in the comments!