I have no idea how or why this started happening however my monitors would go black after 15 seconds of idle.  No power settings or screensavers were causing it, nor did I see any helpful logs to help troubleshoot.  However somewhere/how the Energy Star features of my monitor got enabled and literally after 15 seconds of idle time the monitors would go black..

Simple fix:


This fixed the issue not only for the current logged in session but also after a reboot.

This typically happens if the files (ie pictures) originated from a Windows host.  I’ve found it’s much easier to just remove the spaces in the files than to deal with trying to properly quote your escapes in your loops.