Yeap, this just happened to me about 25 minutes ago - came to google a fix and here I am. After enjoying this game for 13 hours straight I ran into the exact same issue. Cutlist lady told me to kill bad cultist man, opened the gate and I couldn't walk through it, there was an invisible barrier.
Relogged - and was greeted with the intro beginning cutscene and the tutorial stage. I have all my passive and abilities, I am missing a few attacks on my mouse skills but I am souried by this bug. I already had to deal with some annoying stuff in my playthrough (falling through the floor, enemies and loot and I are standing on different planes of existence, and missing entrance queues at the entrances.)
Please get a fix, honestly I hope to god there is going to be one. I love what I'm playing so far - but I don't think I'll be able to muscle through another 13 hours. I really don't want to dust this game and give it a terrible review over a day one bad bug. Please get it a fixed, love the game. But please get this nasty glitch out with a proper fix.