Same problem... what is that item anyway? You can discard it, but opening my inventory slows the client down so much that it takes forever to even try that. (A copy of another character only had one of said item, managed to get rid of that one.)
Something I noticed is that Sybella Artis shows up in different spots on my toon that has the campaign window bug and the one that doesn't - the bugged toon sees Sybella close to Sgt. Knox, and has the weekly challenge campaign quests, while the toon that can access the campaigns fine sees Sybella at her old spot and no…
Looks like we got the same bug... yay? If you didn't try to force verify your game, that was the GM's advice that I talked to - didn't help me, but maybe it will fix it for you. And if not, we can hope for a quick fix together :)
Had a similar issue with some areas in the game (mostly PE and SH) for a while. The other areas loaded just fine, looked amazing with almost maxed settings, but especially in SH, graphics went crazy, I was missing textures and parts of the map took forever to load. Turned out it was my OS - once I switched back to Win7…