The points under 2 - are they related? So, the MicroMPX issue is also caused by going to bypass? Can you reproduce it?
Yes, I was able reproduce the error. Everytime I placed into Bypass and returned, I was able to reproduce it 50% of the time.
FM Out buffer was brought back high (full), Normal out was under 20%. In this mode, in most cases the buffers were brought back into line (FM Out you could hear the buffer being reduced by speed changes). microMPX did not suffer straight away - came back online and after about 5 seconds, the stereo image intensity/level started oscillating noticeably. I have the microMPX decoder running into a 30w RVR transmitter running very low power so I can hear the output of it back in my home office. The level variations could be heard across 3 different FM tuners (I thought it was my Denon unit playing up). FM Output I can also hear locally - I feed it into MPXTool for monitoring and status.
I reported both scenarios (Buffer/microMPX) as it appeared the common trigger was the return from Bypass.
Since you're specifically asking for Dante: Is this with a Dante input sound card? I'm asking because we have tested turning bypass on/off on normal sound cards just a few weeks ago and haven't seen any weird issues. Also, how big are your buffer settings? (Actually, it might help to get your full settings).
It was more of a query of expanding the current AES67 option and supporting DANTE natively without the need of another virtual sound card driver (ie having it fully integrated). I will also admit I have not been able to get the current AES67/DANTE config to work for me either...