like most of u peeps out there, i've got this problem too,
after googling around eventually getting back to this forum, many of the solutions provided din work,
since im working on only one station and it isnt really the satellites problem,
i was stuck for awhile and then i tried to turn off the raytracing in the secondary effects of MR and then it could render, and then when i turn i back on, it suddenly works again!
so my MR raytrace works now =) perhaps peeps out there who's stuck could give this a try?:D
i check mayarayrc file, everythings correct :D so yep
just thought it might be useful:D