a "memory cannot be read" and a "memory cannot be written" problem

Hi everyone !

First of all, since English is not my native language and I am French, I apologize in advance for all the mistakes in my sentences. That said, let's get back to business. I'm a great fan of John's work andI extensively use "PortableFirefox" and "PortableThunderbird" (PTB hereafter). Everything was going with PFB until 30 minutes ago when it crashed repeatedly. Why ? Well, let me explain. Yesterday, I had the following organization : three email accounts, lets call them A, B, and C. Both B and C were "local accounts", i.e they were linked with the "local folder", and A was superior level account in the sense that it was not linked with the "local folder" (I hope I am clear). Today, well in the morning, I deciced to make all the three accounts linked with the "local folder" so I would have only one folder in the left side panel, precisely called "local folder". I have to mention that I deal with a huge ammount of mails everyday, in terms of reception and storage (for instance, I have a subfolder containing more than 3000 mails). Then I went to the "preferences" page and selected the following action for all my three accounts : "check emails at startup". Then I closed it to eat and after coming back I launched it, and here is the message I got :
"
L'instruction à "0x008f85bc" emploie l'adresse mémoire "0x00000000". La mémoire ne peut pas être "read". Cliquez sur OK pour terminer le programme. Cliquez sur Annuler pour déboguer le programme.
"
I clic on the "OK" button and the program shuts itself down. To overcome the problem, I open the "pref.js" file and I manually replace the action "check emails at startup" for my three accounts by "do not check emails at startup", and in doing so, everything got back to normal. I ticked the boxes specifying to check the emails at startup to make sure that selecting this option was the real source of the problem, and I was right, it gave me the same error message. I do not know if this is a serious issue, but I hope someone will take some time to check it further. Anyway, thanks a lot for doing these portables applications, I use them everyday.

whisky.