play failed: An unexpected problem (but not server timeout or HTTP error) has been detected.
HLS isn't broken, though there may be a few outstanding corner cases. We are furiously working to address them. If you want to send me sample links, we can take a look.
From the 3.0 SDK examples (simplevideoplayer):
http://devimages.apple.com/iphone/sampl ... opall.m3u8
Does not work on my Roku2. I was unable to test the big buck bunny url in the sample since that url appears to be dead.
The Roku2 will however, play HLS streams that the previous Roku's won't play, for instance with an MP3 audio track instead of AAC.