I have tried seval addons and PVR IPTV SImple Client on OSMC on RPi2 .
With the same playlist I have used on Kodi x86 and android
No matter what addon I use on Pi2 some streams do not play back . None of the streams are probnlematic on other platforms. Updated the Pi today and its the same
here is one of the streams
http://cspan1-lh.akamaihd.net/i/cspan1_1@304727/index_600_av-b.m3u8
Is this a codec License issue?
Frome what I can tell , looks like h264 to me