Brief
We have fixed quite serious problems in scripts 'cms_functions.php' and 'page_layout.php'.
 
Description
For some pages there isn't defined site_id variable causing different blocks to appear or disappear after refresh.
 
Solution
Download the updated version of the files:
http://www.viart.com/downloads/cms_functions-4.zip
http://www.viart.com/downloads/page_layout-4.zip
 
Further, extract the 'cms_functions.php' and 'page_layout.php' into 'includes' folder of your shop via FTP in BINARY mode replacing existing files. Please do not forget to make a backup copy of the current file in case something goes wrong.