When using the glossary, you can enter a special character in the keywords list, such as a greater-than sign >. If you do this with an auto-linked glossary item, it will make a right old mess of all the HTML across the course.

Steps to replicate:
1. In a glossary, edit settings and change the summary to include the phrase 'good > evil'. (Using the HTML editor, so that the > here will actually be 'ampersand gt semicolon'.)

2. Add a new entry in the glossary:
a. Concept 'greater than'
b. Description 'blah'
c. Keywords: >
d. Set auto-link to true.

3. Save the entry

EXPECTED:

Either, the resulting page should correctly show the entry, and the > in the summary should be autolinked to the entry.

Or, after saving the user should be returned to the form with a validation error on the keyword list indicating that > is not a valid character for use in keywords. (Note, also check other problematic characters & < ", or else have a whitelist. If there is a whitelist it should probably permit all UTF-8 characters above ASCII range so as to support foreign language characters.)

ACTUAL:

Current result is that the heading of the saved entry is mangled; entry displays as:

<%1-%-0%><#1-%-0#><%2-%-1%>

blah