For 2.9.2 and later, please update the entry in sakai.properties for lessonbuilder.filterhtml.
; should instructor content be filtered for dangerous html? false, no filtering, true, filtering.
; If antisamy is enabled, filtering will be done with level low
; if antisamy is enabled, explicit filtering levels can also be used: default, none, low, high
; default is true; THIS IS CHANGE FROM RELEASES before 2.9.2, which default to false
; maybe overridden for one instance of Lessons using an instance property of filterhtml