Hi Tom,
I think you've read about the troubles with the backglass not showing when using brand new VPX true fullscreen mode.
Well, I now have this problem too, and I think it could be related to a newer version of PinballX (unfortunately I have no older version to test).
When starting some (a few) tables having a B2S with large file size (e.g. Medieval Madness), PinballX starts the table and the DMD, but the backglass does not show (the B2S server exe does not load), whereas starting the table without PinballX (within VPX) works flawlessly.
I tried many combinations of older and newer versions of VPM and VPX without any success. Then I created a custom system for VP (defined as custom system type, not VP) and the backglass issue was gone !
Do you have an idea, what could be wrong starting VPX full screen as system type "Visual Pinball" ?
Thanks in advance !