I am using Thunderbird 3.0 and Lightening 1.0b1 w/ the associated GMail provider. I have numerous calendars all using the GMail provider and none using local calendars. When an alarm goes off, the alarm dialog box comes up with the string "Failed to read 'alarmWindowTitle' from chrome://calendar/local/calendar.properties." and the Dismiss and Snooze buttons are completely non-functional. A quick look in the Error Console shows the following error.
Error: Failed to read 'alarmWindowTitle' from chrome://calendar/locale/calendar.properties. Error: [Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIStringBundle.formatStringFromName]" nsresult: "0x80004005 (NS_ERROR_FAILURE)" location: "JS frame :: chrome://calendar/content/calUtils.js :: calGetString :: line 639" data: no]
Source File: chrome://calendar/content/calUtils.js
Clicking the Dismiss button ha no effect, but clicking the Snooze button causes an error to be put in the error log (something about the number of arguments for a call being incorrect). Sorry, but I don't have a copy of this error since I can't get another alert window to pop up.
Everything with Lightening works just fine when I have ThunderSnarl disabled.