Hi, As I was running a (very) old v5 OTRS, I didn’t look deeply into messages from this email list dealing with v6 OTRS. I upgraded my server last week and all seems good and running. But, in system log, I can see numerous errors : Mon May 28 10:11:13 2018 error OTRS-CGI-0 Error deserializing data: Magic number checking on storable string failed at /usr/lib64/perl5/vendor_perl/Storable.pm line 464, at /opt/otrs/Kernel/System/Storable.pm line 116. Mon May 28 10:11:13 2018 error OTRS-CGI-0 Error deserializing data: Magic number checking on storable string failed at /usr/lib64/perl5/vendor_perl/Storable.pm line 464, at /opt/otrs/Kernel/System/Storable.pm line 116. Mon May 28 10:11:13 2018 error OTRS-CGI-0 Error deserializing data: Magic number checking on storable string failed at /usr/lib64/perl5/vendor_perl/Storable.pm line 464, at /opt/otrs/Kernel/System/Storable.pm line 116. Mon May 28 10:11:13 2018 error OTRS-CGI-0 Error deserializing data: Mon May 28 10:10:40 2018 error OTRS-CGI-0 Error deserializing data: Magic number checking on storable string failed at /usr/lib64/perl5/vendor_perl/Storable.pm line 464, at /opt/otrs/Kernel/System/Storable.pm line 116. Did someone experience something like this ? Do you have some ideas to solve this problem ? Thanks ! Egareg JAOUEN Ingénieur Recherche&Développement Tel : +33 2 31 35 34 81 │egareg.jaouen@elitt.com ELITT 8 rue Léopold Sédar-Senghor - 14460 Colombelles - France │www.elitt.com