[otrs] Issue with Calendar Overview after migrating from centos6 to centos7

Hi, I am upgrading from otrs5/centos6 to otrs6/centos7. For the first step i've instaled the new centos7 server with the same otrs version (5.0.17) Then i restored the configuration/data from the old centos6 server to the new server and all the things seem to be ok. The only strange thing is that "calendar overview" don´t display any appointment, but i can see them on the "agenda overview". All the required modules are instaled in the new centos7 server. Has anyone had a similar situation? Best regards, Raul Ferreira