Since F10 installs and uses pulseaudio by default, bmpx should probably also have that selected as its default audio playback. Currently a fresh install of bmpx on F10 has ALSA as its default audio output.
This bug appears to have been reported against 'rawhide' during the Fedora 10 development cycle. Changing version to '10'. More information and reason for this action is here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping
Still trying to contact upstream.. maybe bmpx has already been abandoned.
I'm wondering if bmpx's ALSA output works with alsa-plugins-pulseaudio?
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I'm really sorry, I've just learned BMPx was officially abandoned and I cannot handle bugs without support from upstream. The official successor is http://youki.mp/ but there is no package for Fedora yet, I will consider becoming maintainer though. For now, please find yourself a different media player. Thank you for your understanding!