No sound with any guest on Windows 10 host (after upgrade from Win 7)
VMs that were working correctly before no longer play sound when VB 5.0 is running on a Windows 10 Host.
I have tried both Lubuntu 14.04 and Windows 7 guests with the same results. Tried different audio settings combinations Host Driver: Windows DirectSound and Controller: ICH AC97 (was what I had before and was working for Lubuntu guest and Win 7 host) as well as Intel HD Audio.
When using ICH AC97 on Lubuntu, the visible symptom is that any application that plays audio seems to actually block on the audio component (a player will actually not show any progress in terms of elapsed time).
Looking at the VB longs I see two types of events that seem relevant (attaching full log):
00:00:20.777046 DSound: create capture buffer E_FAIL 00:00:26.406320 DSound: playback start E_ACCESSDENIED
I tried to enable more verbose logging by setting VBOX_RELEASE_LOG to +dev_audio.e.f.l2 but did not get any additional Dsound log lines.
I've also tried older versions of VirtualBox 4.3.30 but no luck.