Sorry for the untimely reply, and for the issues faced so far.
This bug is related to the jQuery UI
Please replace the file aqpb3.9.js found at themes/circleflip/creiden-framework/content-builder/assets/js/aqpb3.9.js with the one attached here.
You can alternatively click on builder blocks to add them instead of dragging them from the top panel to the lower content area.
About the blocks disappearing issue please refer to this article http://support.creiden.com/forums/topic/content-disappearing-blocks-saving/