Pinball Cab (3 Screen) no longer has a backglass

[fallflight]

Hi,

 

So I must have screwed something up and changed a setting.  My backglass monitor will automatically shut off if there is no activity,  but when I play a VPX table without a PUP and a regular B2S,  the monitor stays on and active but is BLACK on many of the games now,  but a few still work.  If I delete the backglass file for a game and fire it up,  the monitor will shut off a few seconds after it is running. I am wondering why my backglasses dont work anymore.  It must be in the VPX setting without a game loaded into the editor.  Just my thoughts but am confident that someone can point me in the right direction.  I have had this cab since 2005 and only recently had this problem.