I found an issue with the way we detect Instacast. The regexes are conflicting.

As you can see the following regexes are very similar:

Feed readers:
Instacast/(\d+) CFNetwork/([\d\.]+)

Media players:
Instacast(?:/([\d\.]+))? CFNetwork/([\d\.]+)

Mobile apps:
Instacast(?:HD)?/(\d\.[\d\.abc]+) CFNetwork/([\d\.]+) Darwin/([\d\.]+)

For example, Instacast/2380 CFNetwork/720.2.4 Darwin/14.1.0 (x86_64) gets detected as a feed reader while it's a media player.

There seems to be an issue with the way the tests are executed because it's not getting caught by the tests.