Wipe entirely your calendar-data from your Thunderbird profile and retry.

I deleted storage.sdb and calendar-data/cache.sqlite and the problem is gone.
But - I found the same problem on all machines/user accounts, where I tried it.
I cannot ask every of our users for wiping their local caches. Do you plan to solve this situation somehow on the "global" level?

Thanks.

Try with pre4, available from: http://inverse.ca/downloads/extensions/nightly/

Seeing the same issue here with Lightning pre4 on linux 86_64.

Hi, Lemme confirm with you if the issue happens with migration of lightning from lightning-1.0b2.105i to pre4 or is a permanent happening with the same version? Also do you see exceptions/errors/warnings in the Error Console?

I noticed it after migrating from lightning-1.0b2.106pre2i to lightning-1.0b2.106pre4i.xpi.

If I delete an event from the Web interface, it remains in Lightning. If I try to manually delete the event from Lightning, the event will not delete, and the event's calendar goes read-only for a while (until the next calendar refresh maybe).

When testing on an XP box, I saw the following in the Error Console after trying to manually remove an event:

Warning: reference to undefined property Components.classes['@mozilla.org/privatebrowsing;1']
Source File: chrome://global/content/globalOverlay.js
Line: 17

Error: this.console.appendItem is not a function
Source File: chrome://global/content/consoleBindings.xml
Line: 83

Warning: There has been an error reading data for calendar: Personal Calendar. It has been placed in read-only mode, since changes to this calendar will likely result in data-loss. You may change this setting by choosing 'Edit Calendar'. Error code: DAV_REMOVE_ERROR. Description: There was an error deleting the item from the server.

Error: An error occurred when writing to the calendar Personal Calendar! Error code: MODIFICATION_FAILED. Description:
Source File: file:///C:/Documents%20and%20Settings/cwright/Application%20Data/Thunderbird/Profiles/yq1uexve.default/extensions/%7Be2fda1a4-762b-4020-b5ad-a41df1933103%7D/modules/calUtils.jsm -> file:///C:/Documents%20and%20Settings/cwright/Application%20Data/Thunderbird/Profiles/yq1uexve.default/extensions/%7Be2fda1a4-762b-4020-b5ad-a41df1933103%7D/calendar-js/calCalendarManager.js
Line: 1014

Error: this.aclMgr is undefined
Source File: file:///C:/Documents%20and%20Settings/cwright/Application%20Data/Thunderbird/Profiles/yq1uexve.default/extensions/%7Be2fda1a4-762b-4020-b5ad-a41df1933103%7D/modules/calUtils.jsm -> file:///C:/Documents%20and%20Settings/cwright/Application%20Data/Thunderbird/Profiles/yq1uexve.default/extensions/%7Be2fda1a4-762b-4020-b5ad-a41df1933103%7D/calendar-js/calDavCalendar.js
Line: 2737

Error: this.aclMgr is undefined
Source File: file:///C:/Documents%20and%20Settings/cwright/Application%20Data/Thunderbird/Profiles/yq1uexve.default/extensions/%7Be2fda1a4-762b-4020-b5ad-a41df1933103%7D/modules/calUtils.jsm -> file:///C:/Documents%20and%20Settings/cwright/Application%20Data/Thunderbird/Profiles/yq1uexve.default/extensions/%7Be2fda1a4-762b-4020-b5ad-a41df1933103%7D/calendar-js/calDavCalendar.js
Line: 2737

Error: [Exception... "'[JavaScript Error: "this.aclMgr is undefined" {file: "file:///C:/Documents%20and%20Settings/cwright/Application%20Data/Thunderbird/Profiles/yq1uexve.default/extensions/%7Be2fda1a4-762b-4020-b5ad-a41df1933103%7D/modules/calUtils.jsm -> file:///C:/Documents%20and%20Settings/cwright/Application%20Data/Thunderbird/Profiles/yq1uexve.default/extensions/%7Be2fda1a4-762b-4020-b5ad-a41df1933103%7D/calendar-js/calDavCalendar.js" line: 2737}]' when calling method: [calIChangeLog::replayChangesOn]" nsresult: "0x80570021 (NS_ERROR_XPC_JAVASCRIPT_ERROR_WITH_DETAILS)" location: "JS frame :: file:///C:/Documents%20and%20Settings/cwright/Application%20Data/Thunderbird/Profiles/yq1uexve.default/extensions/%7Be2fda1a4-762b-4020-b5ad-a41df1933103%7D/modules/calUtils.jsm -> file:///C:/Documents%20and%20Settings/cwright/Application%20Data/Thunderbird/Profiles/yq1uexve.default/extensions/%7Be2fda1a4-762b-4020-b5ad-a41df1933103%7D/calendar-js/calCachedCalendar.js :: cCC_synchronize :: line 270" data: yes]

And I saw this line in the SOGo log file:
localhost.localdomain - - [09/Oct/2011:13:30:58 GMT] "DELETE /SOGo/dav/cwright/Calendar/personal/457E-4E90AE00-13-CA26FE0.ics HTTP/1.1" 404 208/0 0.013 - - 0

Thank you!

lightning-1.0b2.106pre4 looks fine for me.
When I tried it on profile where I used pre3 before, it had the same problem.
But when I used pre4 on profiles where 105 version was used before, I didn't find that problem. I tried it on 3 different machines/user accounts for Linux and Windows TB-3.1.x.

Thanks

So, ludovic I think this bug can be closed now, as lightning-1.0b2.106pre4 does not have this issue anymore.