After changing background area style of sub-menu in Web Presence Builder and clicking on some item from the Menu, website is displayed incorrectly.
Such behavior is considered to to be a software issue and is fixed since WPB 12.0.7. The internal ID regarding the matter is PPB-4317 .
Update WPB installation by using Plesk autoinstaller.
If upgrade is not an optin apply the hotfix:
Rename the original file and place the hot-fix:
cd /tmp && wget http://kb.plesk.com/Attachments/kcs-35674/Editor.js
Replace the files with fixed ones:
cp -f /tmp/Editor.js /usr/local/sb/htdocs/js/minimized/
cp -f /tmp/Navigation.js /usr/local/sb/htdocs/js/Sb/widget/