Russia Today and Al Jazeera English are on transponder 12152, horizontal, 20000. Syria TV and M2 are on a different transponders. The dish may be out of alignment and the receiver is only picking up channels from stronger transponders, but not picking up this transponder.
In the installation menu, bring up transponder frequency 12152, horizontal polarity, symbol rate 20000 and observe the signal quality reading. If it is low, place a small TV visible at the dish and adjust the dish aiming and LNBF skew to optimize the quality reading.
Btw... Yesterday, 1/14/2013, this transponder was very weak due to uplink issues.