I found out the problem is with the 593kbps live stream version of this channel, since yesterday it has stopped streaming altogether (mms://217.218.67.228/presstv) and I suspect it has something to do with the elections turmoil in Tehran.
There is, however, a lower bit rate version 302kbps of this same channel that hasn't had any problems and Wellget has been successfully recording it, along with macromaker for the scheduling.
I guess I can say the problem solved itself.
cool, isn't it?