After upgrading Fan 2.2 to 2.3, somebody have encountered a problem with Nagvis 1.6.3

Javascript error
Javascript error occured: sidebarOpen is not defined
Invalid JSON response: 
Not Found
The requested URL /nagvis/frontend/nagvis-js/index.php&_t=1331553639000 was not found on this server.

To fix this problem, update Nagvis-1.6.4. The rpm is available in the repository.

# yum update nagvis