Plesk 10.4.4 blank page after login, links partially working

[DanieleF]

PRODUCT, VERSION, OPERATING SYSTEM, ARCHITECTURE
Centos 6 - Plesk 10.4.4


PROBLEM DESCRIPTION AND STEPS TO REPRODUCE
Customers can login in plesk but admin, after login gets a blank page. But if I, after loggin in as admin, put directly some urls in browser I can see plesk (example https://mydomain.xxx:8443/smb/web/view ) .. some links/icons works, and many doesn't (they also give me a blank page) for example backup manager, file manager, etc.. Same thing for users, they can login correctly in plesk, but many features give us a blank page (backup manager, webmin...)


ACTUAL RESULT


EXPECTED RESULT
All the features in the plesk panel should work.


ANY ADDITIONAL INFORMATION

At the time of the login attempt, I get this from plesk error_log:

2012-03-10 12:12:09: (mod_fastcgi.c.2588) FastCGI-stderr: PHP Fatal error: require() [<a href='fun$$al/psa/admin/plib/Os.php on line 16

 

[DanieleF]

other errors in error_log

Other errors coming from error_log

2012-03-10 12:49:37: (mod_fastcgi.c.2588) FastCGI-stderr: PHP Fatal error: Call to undefined funct$$es/common.inc.php on line 922

2012-03-10 12:54:09: (mod_fastcgi.c.2588) FastCGI-stderr: PHP Fatal error: require() [<a href='fun$$/admin/plib/common_func.php3 on line 1966