Ran my level 44 NB solo into the Banished Cells and actually reached the First Keeper successfully. I then moved off to find the Second Keeper as instructed. A load screen came up but the game hung during the load. I don't think any load should have occurred. The icon never stopped turning. It turned and turned and finally after several minutes of waiting I Alt-Tab'd to desktop and stopped the game.
Restarted the computer, launched the game as 'admin' always, checked for updates on the launch window, ran repair from launch window, and noted that the bug preventing you from launching any top menu items was still malfunctioning--tried all of them. The browser loads and tries to pull in something but times out. When I got back to Banished Cells I was outside.
I suspect this was a rare occurrence.