" While we still updated our applications in time, Apple did not review them for the AppStore, and instead rejected them first for a crash (sigh!), and later for requiring UI changes, including showing a Save As panel for each generated file. Now this may not sound like much, this is a serious issue for a document scan application which easily generates hundreds of files in an hour, and thousands of files a day, with file names automatically generated, either thru counters, or advanced auto-id features, such as barcodes."
Even if Apple later took back the rejection I bet this was the last straw.