GP Custom page Vs Woocommerce

Hi Tom From Italy

I have your theme + GP on WP ( all lastversion)
I found a problem; GP customize page
http://www.lavocedelnoce.it/wp-admin/customize.php?return=%2Fwp-admin%2Fwidgets.php
"TOTALLY MISSING OUTPUT FROM SERVER" After Woocommerce plugin activation.
Analisys step:
1-Deactivation all plugin
2-Activate GP add on [working fine]
3-Activation 1 plugin for time, starting from first, untill Woocommerce, at that point custom page no have html code output [totally blank]
4-after Woocommerce deactivation all back fine.
5-same test starting to reactivate from the last Plugin

Have you got some ideas how to solve this little trouble ?

Regards Maurizio