Major Bug! Long standing problem: "Attaching" message prevents sending reply

Question

Guys, before I rant I want you to know I love Thunderbird, have used it for many years. However this problem has haunted me for years and I can't believe that it is not yet fixed.
This problem directly relates to problem 1048494 (when long time composing a reply Thurderbird tries to add an attachment the only given option to close or wait) - The suggestions in this post do not help.
This is very easy to replicate.
The problem: It is common to have embedded images in an email. (email Signatures often contain a logo).
It is also common to take time to create your reply - press reply and take time to draft and create the reply.
For an unknown reason - if I reply quickly, within a minute or so, it's ok. Reply sent. If I keep the reply window open for
If you take longer TB pop's up "attaching" and hangs, never sends the reply. It want's to "attach" the embedded images but cant.
Workaround:
My workaround is either to delete the embedded images (a real pain to delete them all if it's a lot of threads in email, multiple logs in multiple signatures), or to copy text into a text editor, cancel reply, reply again and copy text back into TB and send quickly.
I had this problem on TB on Ubuntu and now on Windows 7. It's nothing to do with Virus Scan (I never used that on Ubuntu).
Can someone from development look into this please - It's preventing many of my colleagues using TB.
There seems to be 2 problems here: 1) some timer/delay that makes TB try to 'attach' embedded images 2) the problem of replying when an email history has embedded images
(p.s. I am not talking about attachments, I'm talking about embedded images often found in peoples signatures)
Please TB developer community - Please take this problem seriously:
Happy to send any info you want to help diagnose and resolve this? Please ask.

Answer 1

If you want to talk to developers, I suggest you file a bug.
https://bugzilla.mozilla.org/
But before you do. Try both of the following.
*Restart Thunderbird with add-ons disabled (Thunderbird Safe Mode). On the Help menu, click on "Restart with Add-ons Disabled". If Thunderbird works like normal, there is an Add-on or Theme interfering with normal operations. You will need to re-enable add-ons one at a time until you locate the offender.
*Restart the operating system in '''[http://en.wikipedia.org/wiki/Safe_mode safe mode with Networking]'''. This loads only the very basics needed to start your computer while enabling an Internet connection. Click on your operating system for instructions on how to start in safe mode: [http://windows.microsoft.com/en-us/windows-8/windows-startup-settings-including-safe-mode Windows 8], [http://windows.microsoft.com/en-us/windows/start-computer-safe-mode#start-computer-safe-mode=windows-7 Windows 7], [http://windows.microsoft.com/en-us/windows/start-computer-safe-mode#start-computer-safe-mode=windows-vista Windows Vista], [http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/boot_failsafe.mspx?mfr=true" Windows XP], [http://support.apple.com/kb/ht1564 OSX]
; If safe mode for the operating system fixes the issue, there's other software in your computer that's causing problems. Possibilities include but not limited to: AV scanning, virus/malware, background downloads such as program updates.