Looks odd. The bars on the first layoout do not match the start of those on the second. Could it be a field formatting option?
Try copying fields from second layout onto first (while keeping original fields in place ) and see what you get
Is it a font conflict? What barcode font are you using? Have you tried it on another machine?
Fixed. Whacky. Just cleared the text (command-x), and the pasted back in (command-v). The IDAu_Code128 function picked it up correctly.
Thanks for the input.