Weird. Some receivers can't display logos, is that possibly the case here? You didn't specifically state it, but of course I assume you chose the codecs on the BDs too (and after all most BDs with DTSMA are simply defaulted to that codec, often without any other choice).
I know with many Marantz models of old, they couldn't accept these bitstreams while applying Audyssey or perhaps some other postprocessing like matrixing, due to a lack of processing power. Do you have Audyssey engaged, and if so, what happens when you defeat it?
You have a straight up 5.1 system I presume (not that it gives me many hints at all, but I dunno).
The S570 is relatively current with FW, or at least not on original OTB FW? Hmrz.
No other audio connections between receiver and BDP, and there wasn't any other before either, only the single HDMI the entire time?