The second link in my post is to a thread with detailed instructions on renaming or deleting the configuration folder. It is very important that when you do this you remove any of the remaining extensions before installing them again. The link to the cache file fix was just a reference for any others that may have a similar problem and have found the thread.
I have opened a ticket for you on this issue so that it can be looked into further. To update the ticket or check it's status login and visit your support history.