I have written a fresh image of 2018-11-13-raspbian-stretch-full and have successfully configured and updated the system.
I wanted to increase the number of desktops/workspaces via Openbox Configuration Manager (OCM), but when I click on the OCM application from the menu, I get a cursor with an hourglass, and then application does not launch.
Using the terminal command line, openbox, the response is "Openbox-Message: A window manager is already running on screen 0" and the application doesn't launch.
I have search via Google for a solution, but to no avail.
I had this configured previously, but now after the fresh install and update - Openbox doesn't launch. Any assistance would be greatly appreciated.