[racket-dev] secref problems

Am I doing something wrong, or is this a bug?  The references with 
numbers or hyphens don't resolve, while the others do.

#lang scribble/manual
@secref[#:doc '(lib "teachpack/teachpack.scrbl") "simulations"]
@secref[#:doc '(lib "teachpack/teachpack.scrbl") "interactive"]
@secref[#:doc '(lib "teachpack/teachpack.scrbl") "world-example"]
@secref[#:doc '(lib "teachpack/teachpack.scrbl") "world2"]
@secref[#:doc '(lib "teachpack/teachpack.scrbl") "universe-server"]

Welcome to DrRacket, version 5.0.99.6--2011-01-07(-/f) [3m].
Language: scribble/manual; memory limit: 1024 MB.

David