Quote from Pugin94
You could never fix items with a crafting bench...I'm pretty sure of that.
Even if that's so (and I don't remember) you could in your inventory 2x2 grid until this newest snapshot anyway. That's a fairly key change IMO that has been needed but I find it odd it wasn't mentioned in the notes!
Edit: Also all of my items frames have smoke coming out of them in the upper left and lower right corners - is anyone else getting that?