The "sendto" feature in nautilus is broken atm. I have tracked this to the empathy plugin. If I remove libnstempathy.so from /usr/lib/libnstempathy.so it works. I do have empathy-libs installed, but not empathy itself. Either this is the problem or maybe nautilus-sendto needs a rebuild?
I've tried to fix this (don't know if sending via empathy works now, but at least nautilus-sendto runs)