Missing indicator/notification icons for some applications in Ubuntu 11.04 Classic?

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http://askubuntu.com – I am using 11.04 with Ubuntu Classic (no effects) session. I found that all the default applications have their indicator icons working fine. But for any other application ,which I installed like pidgin, fusion-icon, checkgmail etc, no icon appears in the notification area. These applications are indeed running as I could check from terminal. I checked with default Ubuntu session (which uses Unity) & found that icons are present and working as expected. Also note that this is fresh installation of 11.04. I removed indicator-me and indicator-message. But icons (for new applications) do no (HowTos)