Hello,

it's not possible to understand what happened without a deep analysis and so few informations, there are no clue on this nor i know something about Quix.
I can just give you an advice.
Understand if really Responsivizer is involved in this, because it sounds weird that there is a relation to me, but after all there could be some conflict somewhere. Unpublish all the Responsivizer extensions one by one, plugins, component, module, etc and check if it fixes.

Best regards!
John D.