[tjdean256]

As we all know, acrobat's PDF writer can produce files compatible with various versions of the Acrobat reader. I solved the incompatibility problem between Xournal and Ver 9 PDF files by forcing the pdf writer to create PDF/A files (thus, being readable by acrobat reader ver 5). There are other PDF slash designations, I haven't tried, but I know I can merge annotations on PDF/A files with Xournal.

Edit: PDF/A is an archive mode, recommended for long-term storage. Should be a dependable format

td