Thunderbird can no longer send messages since latest upgrade

Sending a new message, or replying to old messages is not possible: Thunderbird hangs forever, and cannot be closed (not even with Windows 8.1 Task manager. There is no Thunderbird Error log written. In Safe Mode the same happens. A forced windows reboot is the only way to stop this. Anti-virus does not check outgoing mail. Using pop and yahoo, and also gmail/IMAP; the yahoo and gmail accounts (web mail) are fine.
please suggest a solution as without Thunderbird I am helpless (there are 20 years worth of messages in the subfolders!)
UPDATE: I reinstalled Version 30 and now the problem is gone and I can send normally. Anyone has any ideas what is going on? Why can''t I send mail using the latest version of Thunderbird?
I am requesting a reply, please. Thunderbird is no longer workable. The problem came back and sending a message takes 5+ minutes. I've disabled add-ins (safe mode), and antivirus doesn't check outgoing messages. There are no error logs written; TB just hangs and does nothing, and then fails to send.

https://support.mozilla.org/en-US/kb/cannot-send-messages

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