pgAdmin III Version: 1.18.0 (NOT a development snapshot version)
Detail: when F1 key is pressed, or the menu item "Help -> Postgresql Help" is selected, or the toolbar icon "Display help on the sql commands" is clicked, the running pgAdmin will emit an error then quit.
Which error does it emit?
The error message is not informative. Just a msgbox saying whether to close the program or debug it.
I checked the other items in the help menu, such as "EnterpriseDB Help", "Slony Help", etc. They all seem fine. Only "Postgresql Help" will cause problem.
I searched the archive, and found the same error some 5 years back and was fixed by then. It might be a regression.