When using tags such as <span style="font-size: medium"> (created by FCK editor) under Settings>Assessment Introduction>Description/Intro causes the print PDF feature to create a PDF that adobe will not open. Removing these types of tags will allow a user to open the PDF file created for an assessment.
1) Create an assessment
2) In Settings>Assessment Introduction>Description/Intro enter some text
3) Highlight some of the text and then in the FCK editor in the size dropdown box choose a size
5) Print > Download PDF. Make sure "Show Intro & Part's Title" is checked.
6) Open the downloaded file
7) Adobe error (attached)