Backend is funny – no quickedit, no fullscreen mode, slow or not reacting

Hi everybody,

My backend is sometimes not reacting resulting in unsaved work ??
Also

• the fullscreen mode button does not react,
• the quick-edit button does not show and
• I can not enter links, nither in grafic- nor in text-mode.

My active plugins are

• Formidable
• Google Analytics
• MailPoet Newsletters
• MCE Table Buttons
• Page Links To
• qTranslate
• qTranslate slug
• qTranslate support for WooCommerce
• SEO Title Tag
• Social Media Feather
• Suffusion Commerce Pack
• Ultimate TinyMCE
• WooCommerce
• Youtube Brackets

Any ideas?
The webseite is visionautic.org
Unfortunately it is a live site. But if needed I will make a copy for you to analyse it. Any help would be just great!