FYI, my account lets me into the forums, but not into Mantis to report the following bug:
Instructions on using array_filter here are good EXCEPT:
docs.limesurvey.org/tiki-index.php?page=...ributes#array_filter
There is a problem when you display questions by group or entire survey. The way it should work when display questions by group or entire survey is that as you check off items in the list, it should use JavaScript to show/hide the rows in the next question. However, it is broken out of the box and acts erratically. Some will work and some will not.
To fix the bug, open /group.php and edit line 698. Change "phpsurveyor" to "limesurvey".
$appendj .= "ttradio_unselect(document.forms['phpsurveyor'].elements['$tbodyae']);n";
to
$appendj .= "ttradio_unselect(document.forms['limesurvey'].elements['$tbodyae']);n";