another issue (not sure how it was working so far?)
imagegallery/image.php (line 30) change :
require_course_login($course, $CFG->autologinguests, $cm);
to:
require_course_login($COURSE, $CFG->autologinguests, $cm);
$course is passed with too few parameters to require_course_login()
function and get rejected and image is not displayed
General developer forum
Small Image Gallery module.
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