Full Frame Pro Appearance Customize not working after update

Hi, we recently updated to Full Frame Pro 3.7.2 and Wordpress 4.6.1 Our page is https://www.aquariumcomputer.com, this is a network installation for an English and a german website. These are the problems: - appearance->customize doesn't work anymore on the German website (https://www.aquariumcomputer.com/de/), only the customization bar on the left is shown, no preview on the right and no settings can be changed. But the customization still works on the English Website. - occasionally some web pages are not shown although they worked perfect before the updates - after some while and many refreshes the page is shown suddenly, this can take minutes to hours - this also never happened before the update and the English website never shows this behaviour