[plt-scheme] slatex funny error

Anyone know what is going on with the error below? I know that slatex
has its own ideas about line lengths and things that end up with
errors like these, but in this case the contents of the vector seem
suspicious. (I can't find any file that has that text, but maybe I'm
just not seeing it.)

Robby

SLaTeX v. 20050609
typesetting code[graphicx.sty][slatex.sty][makeidx.sty].........................................string-set!:
index 300 out of range [0, 299] for string:
"\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u00...

 === context ===
/Users/robby/svn/exp/plt/collects/slatex/slatex.ss:1224:4: loop
/Users/robby/svn/exp/plt/collects/slatex/slatex.ss:2235:2:
slatex::trigger-scheme2tex
/Users/robby/svn/exp/plt/collects/slatex/slatex.ss:1966:14: loop
/Users/robby/svn/exp/plt/collects/slatex/slatex.ss:1952:2:
slatex::process-tex-file
/Users/robby/svn/exp/plt/collects/slatex/slatex.ss:1966:14: loop
/Users/robby/svn/exp/plt/collects/slatex/slatex.ss:1952:2:
slatex::process-tex-file
/Users/robby/svn/exp/plt/collects/slatex/slatex.ss:1966:14: loop
/Users/robby/svn/exp/plt/collects/slatex/slatex.ss:1952:2:
slatex::process-tex-file
/Users/robby/svn/exp/plt/collects/slatex/slatex.ss:1966:14: loop
/Users/robby/svn/exp/plt/collects/slatex/slatex.ss:1952:2:
slatex::process-tex-file
/Users/robby/svn/exp/plt/collects/slatex/slatex.ss:1966:14: loop
/Users/robby/svn/exp/plt/collects/slatex/slatex.ss:1952:2:
slatex::process-tex-file
/Users/robby/svn/exp/plt/collects/slatex/slatex.ss:1882:2:
slatex::process-main-tex-file
/Users/robby/svn/exp/plt/collects/slatex/slatex-wrapper.ss:85:16