Two Views with autocomplete filters display no result
The link provided by  WaQaR Ali solved the problem. 


  The problem lies in the fact that two form-fields get the same ID.
  Placing this code in a hook_form_FORM_ID_alter(): 


&lt;?php
 $form['title']['#id'] = 'form-text-' . rand(0,100); 
?&gt;


Thank you Ali!