Matroska demuxer fails to parse past the first Cluster

Hi, I'm working on a matroska muxer based on the one Haali wrote for x264. In this muxer, Chapters and Cues get written a the end of the file (after all the Clusters). VLC fails to pick up either, even when there is a SeekHead at the beginning of the file that points to where they are.

Also, if I write one SeekHead at the beginning whose only entry is a pointer to another SeekHead, at the end, which has all the entries for the rest of the file. VLC does not follow this linked-to SeekHead.

An example for the SeekHead-points-to-SeekHead is here: http://www.saintdevelopment.com/files/stf.vlc.broken.mkv

If you would like I can upload samples of files without a SeekHead, and with one large SeekHead at the beginning that points to the same data, which VLC parses incorrectly.