I just added my gmail account on Mail and it spent the weekend downloading the thousands of e-mails I have on gmail, which is fine. However, it stopped downloading mail when it reached "March 22, 2008". So everything from when I first got gmail to March 22 was downloaded but nothing since then. I just got more e-mails on gmail today but for some reason Mail refuses to download it. What's wrong? How can I make it continue?