A new transponder was added at 522000 with the channel FUEL TV. I'm also missing Mezzo Live HD and Ginx TV which should be broadcasting according to my provider but I could always add them later if I find them.
I always use the advanced tuning options and then check "search for Transponder list".
This way, you always get all transponders available from your provider.
For me the transponder list resides at the following:
Frequency: 306000
Symbol rate: 6875
Modulation: 64QAM
I don't know if its different in different parts of the country.