Comment 19 for bug 703389

I'm also experiencing this on both a 12.04 clean install and another machine upgraded from 11.10. The icon is invisible, but can be activated by left/right clicking the space where the icon should be. If you change the desktop theme to High Contrast, you can plainly see a dark gray square where the icon should be.

I have also noticed that doing a killall unity-2d-panel will cause the pidgin icon to display properly, but this does not always work, and the problem reoccurs if pidgin is stopped and restarted.