In Windows 7 you have to tell the OS to always show all icons for this RealTemp feature to work correctly. I haven't played with Windows 8 recently to see if anything has changed.
I just pressed Redraw Icons and now there are 3 visible and 6 listed! More and more confusing.
I set them all to Show, and I got 4. I exited them all. There are 2 left in the list, both shown as Show, but they are not visible.
I'll reboot and start again!