Not sure if it's related to the date fix... but I was putting in some comics and item numbers and barcodes don't seem to be working now on submitted items. Not sure on edits though.
I'm not so sure putting barcodes on comics is a good idea, anyways.
Since the early 80s, the majority comics have come out in both "Newstand" edition and "Direct Sales" edition. Newstand are the ones sent to grocery stores, convenience stores, etc. and have the barcode. Direct sales editions are the ones sold directly in comic book shops, and don't have the bardcodes.
We could also get into Whitman and Baxter versions, too, which ran in the 80s.
Suffice to say, it's probably more of a headache than it's worth to put the bardcodes in. Because then we'd need 2 of each comic in the database to represent both versions.