Thanks Marek, using the start-pulseaudio-with-vchan script does the trick and fixes the problem.
I had already looked through journalctl and couldn't see anything obvious, I'll look at the .xsession-errors as you suggested perhaps that will explain things. Jon -- You received this message because you are subscribed to the Google Groups "qubes-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to qubes-users+unsubscr...@googlegroups.com. To post to this group, send email to qubes-users@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/qubes-users/5f8780f1-dcfa-4476-951b-f1bf2e30527b%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.