Ahh, I see several of us have found the same bug reports. Isn't google wonderful
Anyway, I've just rebuilt xfce including the exo patch from that bug report and all seem to be ok.
I've dropped Pat a note with a copy of my updated slackbuild and the patchfile. but for anyone who can't wait I've attached a tar.gz containing them here.
LQ won't let you upload a tar.gz so I had to rename it to .txt, but it's just a normal tar.gz.