Exactly esmi!
Thats exactly what I mean.
This is what I encountered.
Some developers provide themes with piece of code:
<script src="https://code.jquery.com/jquery-latest.min.js"></script>
or something like so, hardcoded or registered… whatever.
I changed jquery to loading from wordpress native directory ie.:
<script type='text/javascript' src='https://YOUR_DOMAIN/wordpress/wp-includes/js/jquery/jquery.js?ver=1.7.2'></script>
and…. widgets go back to live again. They moveable, editable and… just working.