After doing here for a possible solution to this problem, I found some info
date back in 2009 but none since.
What I have is two Yahoo accounts one works but the other refuses to work. I
can get one or the other but not both at the same time. They are both try to
use the same files. Previous posts suggest setting Cookie behavior to 2
might fix this problem. This is the current default for the TB3 version that
I am using. I was doing some research here for one that was having problem
very similar if not the same problem when I ran into this problem after
setting up the new account. After a few days I noticed that my older account
wasn't working.
If I delete one it causes the second to download all the contents of its
inbox again. It appears I missed something somewhere along the line but I
don't know what it could be.
I am using Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9.2.13)
Gecko/20101207 Lightning/1.0b2 Thunderbird/3.1.7 with
Webmail version 1.3.11 and Yahoo 1.4.7
Eugene Rounds