I haven't tried to view Marestare on my iPhone but I can't view all of them on my Mac. After emailing Marestare I received this response.
"The ones with the red Flash logos or the blue Silverlight logos can be viewed on your Mac (provided they are on.)"
The others cannot be viewed on a Mac so it may be the same problem with the iPhone. They are however converting over to flash so in the future we may be able to watch more. You might try viewing some from the list that have the Flash or Silverlight logos and see if they work.
Hope this helps.