Pulseaudio fails on Fedora 10

[Peter.Onion@xxxxxxxxxxxxxx (Peter Onion)]

Using pulseaudio-0.9.14-1.fc10 (x86_64) After a few minutes
playing......

E: source.c: Assertion 'PA_SOURCE_IS_OPENED(s->thread_info.state)'
failed at pulsecore/source.c:428, function pa_source_post(). Aborting.

Where should I be looking ?

PeterO