yes, that;s good advice from Ryu.
These Dreamlinks are designed with the idea in mind to make the use of M3u Playlist URL method and MAC methods to seamlessly crossover, but it can also mess things up at a connection level.
Do as Ryu suggested first and then next thing is to try a Playlist slot and enter your code's Playlist URL (which is different then the server's portal URL method).
With the Playlist it is necessary to remove the MAC that is attached to that code, but with the T3 I do not think you have to remove the MAC at all, if I remember correctly. So that cuts out the need for that step (this functionality goes along with what I mentioned about ease of use when switching between methods).
There is a written guide posted on the methods.
http://iptvtalk.net/showthread.php?44653-Dreamlink-T3-Playlist-option
if that does not work, simply change back to the MAC method, which your info should still be there intact on that T3 and with the MAC still attached, as outlined already.
There is one main advantage of the Playlist method too (the advantage is actually that you could have the two methods ready for use in your server setups) and that is that you can add an EPG URL as well....this is good if the server's EPG is lacking, which it is at times.
Simply switch back and forth between the two methods at will