I upgraded to 3.6.10. I added a bunch of files to my queue and confirmed they were downloaded. I have been listening to these songs for a couple days (mostly in my car).
Today I went to the gym in the basement of my building. There I have no signal - no cell or wifi. I started DSub to listen to music while I worked out and noticed the options to enable the EQ were missing. Having experienced this bug in the past I rebooted the phone (killing DSub and restarting did not work). When the phone restarted opened DSub, enabled the EQ, and pressed play. I got a message that no internet was available. DSub showed 0b downloaded. DSub refused to play the music I already had on my phone without an internet connection.
I switched to PowerAmp and completed my workout.
Guess its back to 3.5 for me. This time I think I will stay there....