Brief
We have updated the 'admin_cms_page_layout.php' script.
 
Description
When updating site #2 blocks layout, site #1 settings are erased and vice verse.
 
Solution
Download the updated version of the file:
http://www.viart.com/downloads/admin_cms_page_layout-4.zip
 
Further, extract the 'admin_cms_page_layout.php' into 'admin' folder of your shop replacing an existing file. Please do not forget to make a backup copy of the current files in case something goes wrong.