Comment 72 for bug 1181666

Thanks @Daniel von Vugt for your comment.

Meanwhile I experienced the issue again with the "Workspace Indicator" extension not being installed, so this cannot be the culprit in my case. Yet while trying to switch workspaces I briefly saw again that silly Psensor popup window "Authentication is required to update SMART data from /dev/sda". Quitting Psensor removed the blockage right away, to this is the extension to blame.
Where/how best to report this apparent Psensor bug?

I had already unticked Psensor's Preferences -> Providers -> 'Enable support of udisks2' (as suggested as a workaround elsewhere), but this did not help. Now I've also unticked Preferences -> Providers -> 'Enable support of hddtemp daemon'. Since meanwhile all HDD related sensors are disabled in the Psensor preferences I am rather confident that the very annoying blockage is gone. (If not, I'll uninstall Psensor, since Gnome 3 is unable to properly deal with its strange behavior.)