This sounds like an issue that may be resolved by deleting the cache file in the configuration area. Please give this a try to see if it helps to clear up the problems you are having. Here is a link to a page that lists the steps to delete this file.
There are also steps for deleting the config folder but you should only do this if the first thing does not work for you. Please post back and let us know if this resolves the issue for you or if it persists.