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We're going to be using the new webmail internally for a while since we're basically imposing it on our customers :)
When I go to the Calendar view something is broken. Not sure what yet - I might be creating a support ticket soon if I can't figure it out, but hence the reason for this suggestion.
Whatever is breaking my calendar view causes the big spinning circle of loading to appear as a modal overlaying the entire page. This prevents me from going back to any of the other (working) areas of the webmail, such as the email section. So I'm wondering if it would be possible to set the z-index of the top navigation bar to a value higher than the loading modal? Then at least if I end up on an unresponsive page then I can go somewhere else without needing to hit the browser's back button.
In my case, whatever is causing the spinning loading circle on the calendar view isn't even fixed by hitting the browser's back button to go back to the email section. It goes back there, but the loading modal doesn't go away until I do a full browser refresh.
Now to try to figure out what's causing the calendar view to crash...