Now I feel stupid. I tried everything I could think of but I missed the obvious.
If anyone else is having trouble with these Instruction Cards....
It is NOT "Table.png", "Table 2.png", "Table 3.png", etc (or use .swf files)
It IS "Table.png", "Table 1.png", "Table 2.png", etc (or use .swf files)
....Keyboard Keys....
Press I (or press Enter & choose "Instructions" from the menu) to display the first card.
Press RightArrow & LeftArrow (default) to display the next/last card.
Press Enter or Esc to exit viewing the card (goes back to PinballX if on 1st monitor or PinballX animation if on 2nd monitor).
Thanks for your help!