Warning! Possible Thunderbird problem

[Joe Zeff]

Yesterday, I ran an update on my desktop, using F 16 that included an 
update to Thunderbird.  The new version wouldn't run, but I was able to 
get it back by downgrading.

I updated again, today (I do it every morning while my breakfast's 
cooking.) and Tbird "updated" again.  Same issue, but now, I can't 
downgrade or roll back the transaction.  Tbird on my main computer is 
DOA.  I've opened a bugzilla at 
https://bugzilla.redhat.com/show_bug.cgi?id=907043 and am using my 
laptop for email.  (No, I'm not allowing Tbird to update here until it's 
back up on the desktop.)  I don't know what's causing it, but I thought 
I'd put out a warning so that nobody else has to get caught by it, or 
open a duplicate report if they do.