Just upgraded to the latest version through the App Store and downloaded the latest plugin immediately after. When I go to read a thread or click Latest Posts - while logged in or viewing as a guest - I get "This function is currently unavailable - please contact your forum administrator if the problem exists."
Because my password was expired this is what could have been causing my problem. After resetting my password everything seems to be working now. Actually I still can not view subscribed threads and my PM Inbox. I get "You cannot view this page because you do not have sufficient privilege. Please login and try again".
meissen, You have reported this problem a while back we requested FTP access but didn't heard anything from you as we had trouble to connect to your server. Can you check your PM and we can follow-up with you offline.