Alain, I read the issue tracker for issue 2524 and don't see how the error "The user is not allowed to add events to the new calendar" is related to that same bug. Regardless, we just received another error report about this issue and we are asking users to delete their entire Google calendar and re-sync there data to the Google calendar which resolves this issue. This issue also seems to appear when UPDATING _OLDER_ events in the Google calendar if that gives you a clue as to the source of the issue. After the customer does this everything works ok.
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