gendif on "[Plugin: W3 Total Cache] Blank page in w3tc dashboard"

Hi, I have an issue with this great plugin: suddenly in w3tc->dashboard
and w3tc->general settings, I have a blank page.

I have the last version of w3tc.

Thank's in advance for your help,
Gennaro

http://wordpress.org/extend/plugins/w3-total-cache/