Hopefully it was a temporary glitch. Usually, when you get an e-mail that says you have a private message, if you'll just click on the link in the e-mail, it'll take you straight to the message.
Once in awhile I get an error message when trying to go one page or another on the site, but if I wait awhile, it usually clears up. If you're still having a problem with your messages Monday, please let me know and I'll contact someone in technical support to find out what the problem is.