Richard, Don't know if it'll make much difference but I noticed a couple Calendar related changes happened in 105.0b4. Might you try with that version? Also, please check something for me. I noticed recently that on the properties of a couple of my calendars, there was a mis-match between the Username: and Email: setting. On a couple of my accounts, Email: was set to my primary account instead of the one shown in the Username: field. It seems better now that I fixed it so it might help you out to. just trying to tick all the boxes. =)
Bug 1543953 Comment 37 Edit History
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Richard, Don't know if it'll make much difference but I noticed a couple Calendar related changes happened in 105.0b4. Might you try with that version? Also, please check something for me. I noticed recently that on the properties of a couple of my calendars, there was a mis-match between the Username: and Email: setting. On a couple of my accounts, Email: was set to my primary account instead of the one shown in the Username: field. It seems better now that I fixed it so it might help you out too. just trying to tick all the boxes. =)