Created attachment 8524761 [details] Tarball of pop-up GUI and event log errors User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:33.0) Gecko/20100101 Firefox/33.0 Build ID: 20141015093046 Steps to reproduce: I use several different Google Calendars, via CalDAV in Lightning. One particular calendar is problematic - whenever I try to dismiss the reminder pop-up I get an error (MODIFICATION_FAILED, Server 403). I have attached the pop-up error. I have set calendar.debug.log and calendar.debug.log.verbose. I have also attached what appear to be the relevant errors from the log. Fedora 20, Thunderbird 31.2.0, Lightning 3.3.1 Actual results: Pop-up error, events are not dismissed and keep showing up on every future reminder from every calendar, giving another error when dismissed. Must use Window Manager Close on pop-up to dismiss it (temporarily). Expected results: Events should have been dismissed. I should not see them again.
Also note that setting calendar to read-only (which it is) does not mitigate this problem.
I'm willing to test if someone is able to code the fix this bug.
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