Personally, I suspect that to be a Win 10 FCU issue/bug. I've had trouble with several programs not autostarting, depending on the day of the week, the updates installed, the number of reboots and probably the temperature of my morning-tea. Currently all is fine, but I'm keeping my fingers crossed for after the next updates
Oh, and Screenshot Captor always starts fine, it's Skype for business (MS) and/or MS Outlook that's acting up...