What I found was that in my task bar on my computer there was a icon showing the the MTT was still running,although hidden, you had to click on the taskbar to see it.I simply closed the MTT icon then started the MTT anew and it works fine,tho when I exit the MTT I use the exit arrow box to the right as Ssnske suggested.All works fine now.If and when the error message shows up again I just go to where the icon was and I close it and start the MTT and it works fine,just one extra step that really is no big deal.