Just a quick note to advise that I found an issue with the database that goes back to the upgrade that I did last March to the Mysql server that hosts the database for this site, which was causing some errors with date entries into the database, specifically related to sending invitations, and also the user last login date. There may have been other places where this was also occurring, which I have not yet discovered. The fix should have resolved this problem wherever it was occurring. As always, if you encounter any database errors, please make sure you report them so that they can be addressed.