Much as I love the OLC and appreciate the work they do I'm kind of mystified when it comes to how picky it can be when it comes to validating the files. A couple of pilots in my club have dealt with the Cambridge problem over the years. My Colibri battery died making the security seal invalid early last year and none of the flights could be scored until I shipped it away to have the battery replaced and the seal reset. Meanwhile a free app on my damn phone with would produce valid files for the OLC. Doesn't really make much sense.