There is a link to bug reporting on the fvwm home page and when I followed it and reported a bug, my bug didn't show up in the incoming list.
Is there some secret handshake I don't know about? Or is the incoming list moderated and it takes a while for bugs to show up? I was trying to go ahead and get an official bug report going on the gnucash and virt-manager problems where some windows just disappear when they try to popup.