Check that you have ALSA and PulseAudio as options under Output.
Check that your soundcard is listed under device.
Try specifically selecting ALSA or PulseAudio and the device.
I'm not sure why you are getting this error, the AppImage works for me with streaming.
I suggest that you try to install strawberry from a regular deb package.
Or use the repository available: https://launchpad.net/~jonaski/+archive/ubuntu/strawberry
@tibokan
I think maybe it gets stuck if you run make dmg more than once without deleting strawberry.app first.
So to build a second time, remove strawberry.app directory, and run make install and make dmg again.
@edward I figured out the issue with settings not being saved. For some reason the config file, strawberry.conf in .config, was owned by root so Strawberry was denied write permission.. I changed owner to Pi and issue was resolved.
@mataha
The code is there to workaround a gstreamer bug.
However directsound is deprecated and will be removed sooner or later so it's not a priority to fix it.
It will be resolved when we switch to wasapi2.
I have the same problem when I switch between headphones and Mac speakers: system volume doesn't work and I can't use headphones again until I restart Strawberry.