Description of problem:
lightning calendras are empty
Version-Release number of selected component (if applicable):

thunderbird-12.0-1.fc16.x86_64
thunderbird-lightning-1.4-1.fc16.x86_64


How reproducible:
Just updated from -
thunderbird-11.0.1-1.fc16.x86_64
thunderbird-lightning-1.3-3.fc16.x86_64

Steps to Reproduce:
1.run thuinderbirt
2.file/new/ no lightning menu is present
3.lightning icon still open lightning but calendars are empty and not usable
  

Expected results:
Normal calendars use

Additional info:

"yum downggrade" downgrade to 
thunderbird-7.0.1-1.fc16.x86_64
thunderbird-lightning-1.0-0.50.b7.fc16.x86_64
but still not work.