(Two months later) I just installed Catalyst 8.11 and was successfully able to get into Akk-Central with VBO turned on. I walked around for some time, but when I tried to leave Akkaio psclient crashed on me, and it wouldn't let me out of the city until I flipped VBO off once again. Once I did make it to ojapath, I flipped VBO back on and it crashed on world load. Thus I had to flip VBO back off again just to get back into the game world.
EDIT: Is there anything unique about Akk-Central that I don't know about?