I have 5 POP3 accounts, no IMAP. I did click Okay.

I'm new to Opera, so bear with me, please. I just installed the Opera Mail client and so far it's okay. I am having one problem I can't seem to overcome.

In settings there is an option to disable "Show notification for new messages". I uncheck the box and exit, but notifications still display. I go back in and the box is checked. Is there a way to disable these notifications? They are showing up constantly. It's set to check mail every 5 minutes, but these message notifications are popping up one after the other, non-stop. Any advice?