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Thunderbird(windows 10, 64 bit) hangs after upgrade to vs 60.5.1 when "provider for google calendar" is enabled

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I've been using Thunderbird on windows (various versions) for a few years. An automatic upgrade to Thunderbird version 60.5.1 occurred recently and as a consequence the Add-On "provider for google calendar" was disabled and Lightning was left enabled. All existing calendars are not accessible(greyed out).

When the bi-directional add-on (above) is enabled Thunderbird hangs and eventually the message;

"Warning Unresponsive script". 

"A script on this page may be busy or it may have stopped responding......." "Script: chrome://calendar/content/calendar-base-view.xml:185"

Is there a setting that needs to be changed or is the only solution to go back to a previous version of Thunderbird?

I've been using Thunderbird on windows (various versions) for a few years. An automatic upgrade to Thunderbird version 60.5.1 occurred recently and as a consequence the Add-On "provider for google calendar" was disabled and Lightning was left enabled. All existing calendars are not accessible(greyed out). When the bi-directional add-on (above) is enabled Thunderbird hangs and eventually the message; "Warning Unresponsive script". "A script on this page may be busy or it may have stopped responding......." "Script: chrome://calendar/content/calendar-base-view.xml:185" Is there a setting that needs to be changed or is the only solution to go back to a previous version of Thunderbird?

All Replies (4)

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usually add-ons are disabled because they are not compatible in the upgrade process. Have you checked you have the latest version?

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That was my first thought but I've un-installed Lightning and the Provider numerous times with no positive result.

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In the calendar properties is the offline support box ticked? try unchecking it.

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In trying to check if the off-line support box was ticked, it became apparent that all my calendars(I have 6) were not available to be modified.

I've deleted them all and re-added and the problem has been resolved.

After numerous upgrades, this is a first.

Thanks for the help.