If i have a colon : in the title of a page I get an error on the PDF export. I've tried copying the page and exporting the copy, but i get the same error, so I believe it has nothing to do with the page itself, but simply the title having a colon. I'm not sure if there are other characters that will reproduce this same error. i can export to word just fine, but not pdf.
confluence 4.1.9
