Is it possible that there's a bug with the Weight setting? It's a slider, but it seems to be a boolean: Weight yes/no (There's no interpolation).

that's not a bug, the value is passed to the system function for creation function
http://msdn.microsoft.com/en-us/library/...S.85).aspx
it then converts Flt weight 0..1 to fnWeight [in] 0..1000
that system function is responsible for font creation