Backglass window off screen
What it means
This table's backglass window will never appear — it's positioned somewhere none of your screens actually cover.
Why it happens
ScreenRes.txt (or this table's own override) saves an exact position for the backglass window, but that position was only ever valid for a monitor layout you may no longer have.
How Pincab Toolbox detects it
The declared backglass rectangle doesn't overlap any currently connected monitor's actual position.
Check your own pincab
Pincab Toolbox is a free Windows scanner for Visual Pinball X and PinUP Popper. It finds and explains problems like this one. No account, no telemetry.
Download for freeCovered: Visual Pinball X (10.x) and PinUP Popper. Not covered: Future Pinball, Pinball FX, Visual Pinball 9 and the other frontends (PinballX, PinballY).