First I apologize for the delay in response and many thanks for efficiency.
As to the question:
1. List of plug-ins is: Akismet, All in one Favicon, AWD Weight / Country Shipping, Better WP Security Block Bad Queries (BBQ), Currency Converter, Fast Secure Contact Form, Google Language Translator, Hello Dolly, Hyper Cache, mb.miniAudioPlayer, P3 (Plugin Performance Profiler) Scroll to Top Button, Shareaholic, Very Simple Sitemap, Viper's Video Quicktags, WooCommerce, WooCommerce Admin Bar Addition, Custom Product Tabs Lite WooCommerce, WooCommerce Print Invoices & Delivery Notes, WordPress SEO, WP Smush.it, Wptouch Mobile Plugin and Newsletters Wysija.
2. Yes, my website is a complete online store and the first page is an image gallery.
3. I installed the plugin again and again the same blank page appears (before I had w3 total cache instead of hyper cache ).
P. S. Sorry for automatic translation.