I'm getting a segfault when gmusicbrowser starts up while it's reading my gmbrc. None of the old backup ones work, it does work without one at all but obviously I lose all of my filters, ratings, etc.

Perl just got upgraded to 5.20 on my machine, maybe that's related.

Yes it's probably because of perl 5.20, it seems starting it with "LC_ALL=C gmusicbrowser" makes gmb work, thought without localization.
If that's not enough, I've heard someone had a problem with the notify plugin, you can disable it with the command line option "-plugin NOTIFY" or you can disable all plugins with "-noplugins"

LC_ALL=C had no effect, but disabling the notify plugin did. Thanks.