After some more investigations I've concluded that the Evince problem I've been seeing is actually due to a bug in Firefox - basically it does not close all file descriptors (as it should) when launching external helper apps hence evince inherits the open sound device and hangs onto it after firefox is closed. I've reported the bug on Ubuntu's launchpad - it could also be a nasty security vulnerability.
News flash: It seems that this bug was reported a while ago on the Firefox bugzilla but it _still_ hasn't been fixed??!!
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