It is probably related to the recent fix https://wplms.io/support/forums/topic/no-edit-in-admin-bar/.
There is an error on a course preview (Preview from Courses page) page, if the course in a Draft mode.
Parse error: syntax error, unexpected 'endwhile' (T_ENDWHILE) in ...\themes\wplms_modern\course\single\front.php on line 81