I'll share mine, just to see if anyone else is experiencing similar oddities. I've already submitted these concerns via the Keep's feedback button.
Now, for the most part, the Keep works well for me. No tiles are reverting, the speed is fast, and I can see all my achievements, DLC, and custom heroes (even though I used mods including cosmetic ones). However, I still get an "Oops, an error has occured" message and no amount of refreshing or logging out, clearing the cache, and then logging back stops the message from appearing. But then I'm brilliant at creating strange errors. Does anyone else get an error message, when there appears to be nothing wrong?
Another thing, my friends list is empty (as in, I click the friend tab on the right sidebar and no names or avatars appear). What this means is that I can't share world states with friends, but they can share world states with me. Anyone else experiecing this?