Weirdest glitch just now. I was playing Curse of Malekith with Arachne and it did that weird thing where when you jump over your opponent, you just stand in the air like you're on some sort of shelf. Okay. Fairly standard glitch. Whatever. BUT THEN I STARTED FLOATING.
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I floated all the way up to the top of the mission, phased through the tower, and then dropped back down. I thought "Oh good. I'm going to get to play-through and didn't just waste all that time." Nope. It dropped me in a part of the mission I hadn't been to yet. No enemies would spawn so I could advance, and there was a gate blocking my way back.