Problems with calendar in Suitecrm 7.7.8

Hello

Recently I upgrade suitecrm to 7.7.8 version, but when I open the calendar, it appears empty in all options.
Anyone knows how to solve this issue?

Regards,

Diego

could you please attach a screenshot and info like upgrade path, php version, anything in the error logs etc

I Solved the problem, I Restart the server and works fine.

Thanks.