Spumux not playing nice

"Jani Patanen" <[email protected]>
Newsgroups gmane.comp.multimedia.dvdauthor.user
Message-ID <[email protected]>
I have a program with 2 subtitles:
Finnish and Swedish.
Usually they are decoded to program.d/ directory  for Finnish and program-02.d/ for swedish.
I mux Finnish to stream 0 and swedish to stream 1.

Sometimes, the languages in directories are reversed. ie. program.d containing swedish and program-02.d finnish.

If I execute 
spumux -s0 -P program-02.d/spumux.xml < temp.vob > program-fi.mpg

I get mpeg with only finnish subtitle track. 
If I continue with
spumux -s1 -P program.d/spumux.xml <  program-fi.mpg > program.mpg

suddenly the first subtitle track is no longer finnish, but swedish. Is this a bug or a feature?
What affects on the order the languages are available?

I'm trying to create DVD with several episodes. On the subtitle selection first one is Finnish.
(dvdauthor ....  -s fi,sv), but because of the problem described above, some episodes display incorrect subtitles.
how can I get around this issue?

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