Guru hints not working in pgAdmin

Question

Guru hints don't work on my pgAdmin (1.18.1) - no hint was ever shown, "Hints" item in "Help" menu is grey and even though I can set options for the hints, the changes won't save - when I open "Options" the next time, both fields are unchecked again. I ran the installer again to "repair" the install, but the hints are still not working.

So how to enable the hints?