Maya: MDGMessage.addPreConnectionCallback crash

Hi all,

Has anyone sucessfully used the MDGMessage.addPreConnectionCallback from python? If i attempt to setup a callback on this, all i get is a nice wee crash.

It crashes on the following for me: win maya1012, win maya 2011.5, mac maya 2012

interestingly, MDGMessage.addConnectionCallback is happy and does not crash.

Any insights gratefully accepted.
cheers,
chrisg