Hello,
the current SVN revision 704 (successfully compiled and installed on Debian Lenny/Sid) crashes immediately after beginning the tutorial or a single player game, regardless which resolution is chosen or whether running in GL or SDL mode:
$ mars
data directory is: /usr/local/share/games/mars/
home directory is: /home/christoph/.mars-lonm
mkdir /home/christoph/.mars-lonm: File exists
mkdir /home/christoph/.mars-lonm/screens: File exists
[ERROR] XmlElement::IdentifyElementXml [ERROR]
Unknown XML tag: weight