You may need to ensure trusted content is allowed in your editor - I can't remember the exact setting, but there is, somewhere (sorry Im not at my moodle testing PC at the moment so cant check it out), a setting that normally has atto/tinymce stripping content from the editor to prevent malicious code being entered in forums etc. It may be that Mary has this released and you may need to do the same? (Mary may be able to confirm?)
General developer forum
Databases: How to list course in multi categories
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