I realized if I do weblogger-select-configuration FIRST, it works. however I get a bad user/pass combination error if I leave the password blank in the variable weblogger-config-alist. If I put the password in, however, then everything works after I select a weblog.
Maybe it's possible to automatically select the first configuration when Emacs starts up. I'm not sure why it won't prompt me for my password like it used to in version 1.4.4.