> Werner - I've done just that: The file compiles just fine unless I > try to change the font. [...]
This very much smells like a bug in LilyPond's font handling, probably specific to the Windows platform (otherwise we would have seen from Abrahan, the author of the Beethoven fonts0. It might be a problem in LilyPond itself or in one of the used libraries. Jonas, do you have any idea how to let Jesse create a backtrace easily? Werner