I've had occasional bad files which play fine when redownloaded. They seem to happen in batches. I finally noticed that it seemed to happen most when I'd visited somewhere with free wifi, of the kind that requires click-through of an agreement page, like McDonalds. Sure enough, checking my current set, I find 5 files the the linux 'file' command think are HTML, and they are: 4 are McDonalds and 1 is Hampton Inn. Given the timestamps, these downloaded real fast, before I had a chance to sign in. (I may never have, actually) Let me know if there's anything else I can do to help.
DoggCatcher Version: 1.2.3605
Device: HTC ThunderBolt
Android Version: 2.3.4
We've got some logic to detect that but it must have failed to detect those files. Can you send one of them to me the next time it happens and I'll add it to the test cases.
Thanks.