1560283 - Lightning disappears after Thunderbird restart

Status: RESOLVED DUPLICATE of bug 1560547

(Calendar :: General, defect)

Description

[Christian Riechers]

TB68.0b1 64-bit, Linux
Lightning disappears for unknown reasons when Thunderbird is started, even though is was present during a previous Thunderbird session before. This is not exactly reproducible, it happens after may be 2 or 3 Thunderbird restarts. So far is has happened multiple times, so it's not a single event. This behavior started with TB68.0b1/Lightning 7.0.

Disappear means, Lightning is present and enabled in the Add-ons Manager, but the Today pane is not visible in the TB GUI. The 'Events and Tasks' main menu bar item is present.
The 'Today Pane' button at the bottom right corner is present, and the Today pane can be invoked from it, but it shows no current events.
The 'Switch to Calendar tab' button at the top right corner of the main window is present, and the Calendar tab can be invoked from it.

Attached is the error console log after a TB start when Lightning is gone, and when it's present as it should. No changes have been made to the calendar(s) in between.

The Today pane should always show when Thunderbird is started, when it was present before.

Related or not, the Enigmail extension shows a very similar behavior, i.e. it may just be gone from the GUI after a Thunderbird restart. The difference to Lightning is that no Enigmail menu items are present at all, even though the extension is visible and enabled in the Add-Ons Manager as well.

Comment 1

[Christian Riechers]

Attachment: lightning_gone.txt

Error Console log when Lightning Today pane is not visible.

Comment 2

[Christian Riechers]

Attachment: lightning_present.txt

Error Console log when Lightning Today pane is present.

Comment 3

[Christian Riechers]

Still happens with TB68 beta 4.

Comment 4

[Stefan Sitter [:ssitter]]

First error in the log file is RangeError: date value is not finite in DateTimeFormat.format() minimonth.xml:722:70
This error is tracked with Bug 1561452 / Bug 1560547.