I logged in yesterday after about a 6 month absence, and I am unable to get into my lair. There is a large black rock over the entrance.

I have cleared my world cache and done a full scan, but the problem is still there. How can I get back into my lair?

The chambers are still there - I can see them when I open the plot detail window, I just can't get in. I submitted a ticket yesterday as well, but have not heard anything back yet.