We missed out on this one with all the other news (and playing about in Windows 7):
To all Live Mesh customers who have experienced crashes with the 0.9.3712.831 version of the Live Mesh for Mac software: A new version of the software that resolves this issue is now available.
Please update or reinstall Live Mesh for Mac to receive the new version. If you continue to encounter problems, please let us know.
The Live Mesh Team.