A PostScript error undefined offending command CT_T3HdrDICT can show up when you try to output InDesign 1.0 PostScript files from Scenicsoft Preps. The error is caused by incorrect dictionaries that are embedded in the fonts used in InDesign file.
Solutions
This one seems easy enough to fix:
- Use InDesign 1.5 or later.
- Convert the text to paths.