Comment 7 for bug 345599

I'm seeing this with 100% repeatability. I use both Pidgin and Evolution. When I open them, they both appear in the indicator applet as expected. However, eventually they both seem to disappear from the applet in turn (never at the same time), so that the applet hides, as if neither Evolution or Pidgin are open. The only way to get it back again is to close Evolution and Pidgin and restart them both

I've no idea what triggers this. Sometimes it only takes a few minutes for this to happen, but it's never more than a couple of hours for both Pidgin and Evolution to disappear.