I recently applied a whole bundle of updates including alsa-lib on my Fedora Core 4 x86_64 desktop. Since then I started getting the error message
ALSA lib control.c:817:(snd_ctl_open_noupdate) Invalid CTL default
Open error: No such file or directory
whenever I tried to open alsamixer, and similar errors and crashes running other apps that expected to be able to use the Alsa sound system (which worked quite well before the update).