V 6.2.2 or V6.2.1 - by: mtra

Hello
after upgrade on V6.2.1 all details (project, activitie,etc) are replace by red box.
and in log file i have :
2017-04-26 12:41:37.565 ***** ERROR ***** [V6.2.2] on file 'D:\wamp\apps\iproj\view\objectDetail.php' at line (4510)
2017-04-26 12:41:37.565 ***** ERROR ***** [V6.2.2] cause = ob_get_clean(): failed to discard buffer of zlib output compression (1)
an idea ?
thanks