I thought I'd ask since others must be having the same problem. I've tried twice on a fresh install of 64-bit ubuntu with Lightning/1.0b2 on Thunderbird/3.1.10. The lightning calendar works fine at first, but within a day it quits working completely. No events show up on the calendar, I get no reminders, if I create a new event, it doesn't show up, etc. The calendar is 100% empty and never gives any reminders. Has anybody been able no resolve this?