xslt problems

hi all, I'm running sablot (--with-sablot=/usr/local/Sablot) and am getting very strange behavior surrounding xslt_process. sometimes, I get a processed page. then (with no change in any of the files), I'll get an error: "Fatal error: msgtype: error in..." I did a little looking, and all I could find was some pissed-off looking bug reports and a couple posts in various places. So question: -is this a bug? -if so, great, that's that, wonderful to have a fix, etc. -if not, uh, what am I doing wrong such that I get random fatal errors form sablot? ---- any info much appreciated. xslt freaking rocks... _alex