for instance the calendar does not load, nor does the dashboard, sometimes the reply box does not load or the submit button
Are you sure you are using a supported web browser? Supported Web Browsers
If you are using Safari it generally won't update unless you also update your operating system. So if your OS is not up to date Safari also will not be. I typically use Google Chrome on my Mac and it tends to auto-update and stay current no matter what the version of the OS is on my computer. I suggest trying a different web browser to see if that has any affect.
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