Comment 7 for bug 1064493

I'm also seeing the behavior that LGB describes after whitelisting all systray icons. In 12.10, this seems to affect Pidgin, VMware Workstation, and Vuze. In 12.04 it also affected Shutter, but no longer in 12.10. There seems to be some relationship between the icons disappear and workspace switching.

Immediately after logging in, all of the icons work properly. Any incident of the icons disappears seems to follow a workspace switch, although I'm not certain that the very first workspace switch after a login or unity reset results in the icons disappearing.

Once this occurs, the icons are still visible when the Dash is brought up or while switching workspaces or viewing all workspaces with Super-S, but are not clickable.