[jsp1]

Ah, OK will try again @ 44.1. Not really sure about the Tronsmart's sample rate, nothing really shows it under SPMC's Audio settings.
Also am I still running OE 4.x? How do I get 5.x?
I don't see anything under Audio settings for "Passthru", either
If another files starts to dropout, I will send it to you to check out.
Thanks Matt!

doesn't your receiver show the input source info?
OE 4.9x = OE 5.0 beta/RC.
Passthru won't have settings except to enable it, and set which formats (DD/DTS, etc) your receiver can accept.

Switching the sample rate to 44.1 seems to have fixed it. (as far as the music files dropouts)
There is no setting to enable Passthru under System/Settings/Audio Output, only Audio Output Device, # of Channels, Output Config., Limit Sample Rate,Stereo Upmix,Maintain Original Volume on Downmix, Resample Quality, Keep Device Alive,Play GUI Sounds, and Reset to default settings.
Before I set it to 44.1, the receiver showed Audio setting for DolbyII Movie, Music, Dolby Pro Logic, DDigital, Neo Cinema & Music, and Neural Stereo. Not it only lists PCM DDigitalEX, and DolbyII Music

Enable passthrough is located right under "Play GUI sounds" on the audio output settings page.