menu navigation does nothing

Hello all,

my project to write a script that automatically creates the necessary 
contents and XML to author a DVD is almost done. Goal is with 
one or two command lines from any source(s) to create a DVD with menus.

The spumux processes do not output any error messages any more. 

Dvdauthor complains about the muxing state of the MPEG2 video stream for 
some reason. I mux using mplex. 

But the reason why I write to the list is that I get a DVD data structure 
that does show menus, but does not react on any navigation commands. It 
does neither highlight the selected button nor execute the action assigned 
to it. 

Obviously I still have problems understanding the logic behind the 
navigation commands. I do not see a point where to find the reason for 
this misbehaviour. 

I have uploaded a ZIP archive with the sources (without the actual movie
for obvious reasons) here: http://dump.fangornsrealm.eu/example.zip

It includes all the XML files, the background pictures and an error log 
with all the errors that spumux and dvdauthor threw. 

I hope someone can point me in the right direction. 

Thanks, in advance, 
Alexander

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