Editor cleans HTML tags/attributes in 1.70
It then has problem with embedding Flash and YouTube movies. Solution: in limesurvey/classes/inputfilter/class.inputfilter_clean.php, function inputFilter, change the line
$this->xssAuto = $xssAuto;
to
$this->xssAuto = 0;
to disable the blacklist of the "known" "dangerous" tags and attributes.