kdl typekit lost KDL.JntArray composition function


I can't generate a KDL JntArray from a property file anymore:
[ ERROR ][PropertyLoader:configure] The type 'KDL.JntArray' did not provide a type composition function, but I need one to compose it from a PropertyBag.

This worked before AFAIK, but I can't find the lost code.
(Syntax of property file should be ok, its still able to create a property file from a KDL JntArray, and I verified that its still the same as the old syntax)

I'm running Ubuntu Precise with ROS Fuerte, Toolchain 2.5.0 and rtt_geometry (master, freshly pulled)

any idea?