Been working with the DOL2 and the new Playlist portal this last while.
I see some trouble with changing channels when using the Playlist portal and with the m3u file installed thru USB. I don't know how I missed this before, probably because I checked one channel and then I was checking out the menu functionality more then anything else (at the time).
So problem is that it will not change channels.. well it will physically change, but the new channels never appears to connect. You have to exit the DOL2 app and then re-enter and that last channel you tried but failed, will now appear normally, but try changing channel again and it fails again.
I was using an edited Playlist and it had blank spaces between each channel line. I put them blanks in there for ease of the editing process'.
I thought maybe that was the trouble, so I grabbed a fresh Playlist (un-edited), and came across same scenario. First channel appears, but can not get any other channel to connect until you exit the DOL2 and re-enter.
Have not tested the Playlist thru URL yet but will do asap