After some updates (I don't remember wich ones) a bug occured in Thunderbird with Lightning extension. When I clicked on the Calendar icon, it would display a blank page instead of the calendar.

Here is what I did to solve the problem : - In Thunderbird, click on Tools > Add-ons - In the Extension tab, just disable Lightning (no need to uninstall it) - Close Thunderbird - Launch Thunderbird again and enable Lightning extension

Now it should display as usual.

Damn ! I can't edit my post.

Sorry for the bad spelling ("which ones") and the bad page setting.

A little update about this trouble.

Lately I had to install gNewSense on a new computer and I encountered the same problem (i.e. a blank page standing for the calendar after I installed back the Lightning extension in Thunderbird). However, the solution I posted here a few months ago didn't work this time.

Fortunately, I could figure out what the poblem was. Indeed, the solution is given here in the Lightning system requirements page (Linux section of course) :

http://www.mozilla.org/projects/calendar/lightning/system-requirements.html

In my case, I just had to install the libstdc++5 package which was missing on my system. Then I applied the first solution I gave before (deactivating Lightning extension then reactivating it).

Now, Lightning 0.9 just works fine.