Sounds like time for the external member rebuilder - open up a support ticket
, including FTP login info. We'll run the rebuild and get your board back up.
After we get your board back up, please change your site styles to that the Infopop copyright/powered-by statement at the bottom of the page is visible. Hiding it like you are now is a violation of the license agreement.
You really, really need to upgrade, citing the 5-series end of life date
of March 15. 5.47d is over four years old.