Sound tracks STILL spontaenously inaudible-BMD pls help!

I thought I had my audio failure at least[b] partially figured out, but no. [/b]

1) Will not play through computer speakers as before.
2) Set preferences to go through USB interface into monitors and worked... for a time.
3) Opened DR17.2 Studio this morning to continue editing project... no sound.
4) Checked preferences. Still set to MOTU M4 (USB interface) but no sound.

Edit: After I typed this initial help request, I went back to DR17.2 and hit the space bar again to see footage before closing the program and there was sound through my monitor once again. I had sat here for 5 minutes trying to figure things out before going to the forum and probably another 5 minutes typing up this request for help thread. WHAT IS GOING ON?????

I AM STUCK AND THIS IS REALLY FRUSTRATING. WHAT IS GOING ON HERE AND HOW DO I FIX IT????

I've found that traditional digital/analog audio connections are more reliable than USB, so I believe the later should be avoided.

I've found that traditional digital/analog audio connections are more reliable than USB, so I believe the later should be avoided.

The computer's speakers do not play the audio regardless of the setting. I never had issues with DR16regular or DR17regular... only Studio and very recently. It has left me no choice but to go through my USB interface/monitors that I use for audio recording. It is the only way I can get audio playback via DR17 Studio.