are you connected via HDMI? what TV do you have and what's its native resolution? what's the resolution setting of the Dish box?
sounds like you may be double-processing/scaling or doing double conversion from interlaced to progressive and back to interlaced or vice versa. obviously I don't know your experience level in making adjustments to the settings.
if the the sat tuner is set to output interlaced, most likely, then you want to leave the Pioneer res to Auto and Pure Cinema to Auto IMO. if its set to 1080p, then deinterlacing serves no purpose since it's already done by the box. the video chip in the receiver may be double-scaling or double conversion. if your TV is LCD/plasma pixel display, then IMO, it should be the device to do the deinterlacing to progressive and you may want to turn the Pioneer's video converter off and be done with it.
1) check the Dish output, change if needed
2) try setting the Pioneer resolution to Auto or Through and Pure Cinema to Auto for the Dish input. set Pure Cinema if that doesn't help then...
2) just turn the Pioneer video processor to match the same resolution & i/p as the Dish
3. or just turn off Pioneer video processor for the Dish input. let the Dish box or TV do the scaling. if turning it off solves the problem, you can leave it off or continue to try adjusting but do one at a time, not both. I forget which Prog Motion direction makes the output more match film frame rate (24) and which makes the output more match video frame rate (60) but go one way and if that doesn't help, try the other.
you also may be down-rezzing the video in the Dish and then up-scaling it back again with the Pioneer and even with that not matching the TV.
but IMO, Progressive Motion/Pure Cinema is a setting that's probably best left alone or in default setting. it effects the 3:2/2:3 pulldown in the conversion of interlaced (480i, 1080i) to progressive (480p, 720p, 1080p for fixed pixel TV's) video scan & handling video content at 60 Hz (frames/sec) vs film content at 24 frames/sec. there is no one setting that one can say will be the right one for your setup...the default has always worked for me with both a 1080i RPTV and a 1080p plasma.
it was a tweaking tool but my experience never needing adjusting with Pioneer DVD & Blu-ray players to either a 1080i or 1080p display. improperly adjusted, it can contribute to degrading an image, possibly causing judder, motion artifacts.
my advice is unless you know what these settings do & how they work, leave them at the defaults, Auto, or just turn the Video Converter off for specific inputs in the setup menu. you can have it turned on for one input and turned off for another. if you do know the terminology & understand these settings, then you can tweak knowing you could make things better or worse
I've owned Pioneer players since the early 2000's, and in each case, other than noise reduction, I left settings like chrominance, progressive cinema, etc alone. Sure I tinkered with them just to see the results but always ended up putting them back to defaults because I didn't have the calibration tools to properly use them. unless one is a calibrator or knows how to use scalers & video enhancements, they can do more harm than good.
I do recall once encountering just exactly what you described and it was because of double conversions. that's why I suggest Auto default settings or Off