Uses unable to register

Hi, everything was working fine, nothing has been touched on the server but something is not working.

Sometimes - when a user tries to register they to get a thank you for your registration email but after the account is approved no further emails get sent and the user stays in the membership review page. after they membership review is rejected and they try again nothing works.

Sometimes every thing is fine. Do you have any pointers ?

Regards
Sounds pretty strange that it works sometimes and not others - especially if the initial thank you registration email works (otherwise i'd think it would have something to do with email delivery). The next time this happens, immediately check the SharePoint log file. There should be an exception listed in the log file with the error that is preventing the approval from completing.