I just updated foobar and my game music components today, one of which was foo_psf. Now, whenever I try to play any of my PS1 psf files, I get the following error:
"Unable to open item for playback (BIOS load failure)"
As far as I know, foo_psf doesn't ask for BIOS files, so this doesn't seem like something that I could fix myself.
I wasn't really sure how to look for info on this, so my apologies if this problem has already been solved somewhere else.
I was seeing this as well. If you're still seeing it, upgrading the plugin should fix it. I'm using 2.0.34 now and it works perfectly.
People don't read change logs that specify that a PS2 BIOS is required, so I gave up on that.