As mentioned in the patch notes, you right-click all orbs and essences to use them now, not cube (Except for Orb of Alchemy). Monsters not having their names is weird, I believe someone else had that issue because they used D2SE to install other D2 Mods, I would just try a full reinstall. Shield Barb should be fine, if you're weak against high level monsters you likely just lack damage or physical pierce. Many monsters such as the ones with purple names heal themselves every several seconds so you have to have more damage than they have heal, this is to prevent "cheese" mechanics early on.