I think you should try renaming the configuration and re-installing to see if it clears this up for you. Here is a link to a post with steps you can take to rename the configuration folder and undo any corruption that may have occurred in there.
showpost.php?p=12293&postcount=2
Please give this a try and let us know if the issue persists. If so I will open a ticket for you on this issue so that it can be looked into further.