wine users - Feb 2012 - Re: Read this if your sound stopped working in 1.3.25

Update for PulseAudio users: many of the problems with PA and Wine have been
caused by bugs in PA and/or alsa-plugin. Some of these bugs have been fixed in
the latest versions of PA (1.1) and Alsa (1.0.25). If you are using older
versions of those packages, upgrade.

Note that the need to restart the PA server sometimes is a bug in PA, not Wine:
https://bugs.freedesktop.org/show_bug.cgi?id=46296