Missing notification icon for new email

Hello, sorry if my question was already answered somewhere, but I tried to seach without luck. My EM client can not display new mail notification icon. What should be not so big problem, but I have in properties to minimize EM to tray. Icon is there but when new email arrive then the EM icon disappear. Probably it is because the icon is change to new mail icon, but the icon is not working. I then have to go to start menu a run EM again to be able to work with it, because I am not more able to doubleclick on tray icon and open it.

However EM is the best client I ever use.

Now I see the icon. It popup after hours of running eM client. I will keep an eye on it and post here if it will again disappear.