Sounds like the decoded frame was not fully DeFined. An occasional quirk of Xy4 is that DeFined blocks sometimes don't display properly -- the highlighted text on screen doesn't correspond to the actual block of text in memory. The fix is to toggle between Draft and eXPanded views a couple of times to make the actual DeFine display accurately, and then adjust the start and end points of the highlighted block as necessary.
This worked--as far as the decode went. Still impressed by how fast the XYENC/XYDEC frames work: stares at you for a second then . . . done!
However, CAB itself aborted with the error msg on the prompt line "Mismatched logical or numeric operands. 180" Or another time the number "200." I think there may be more to the message without room on the prompt to display it. Several attempts with PDF files=Some result. Back to you, C.D.