I found this suggestion, you can try this:

http://www.google.com/support/forum/...30f2d353&hl=en


In Gmail, I searched through the tabs on the settings screen. I found that under the Forwarding and POP/IMAP tab, there was a radio button under item 2 that read "disable POP". By clicking this button and hitting save, the problem has been completely resolved! Hope that helps.