Rated 5 out of 5 stars

I used it a lot in the past (the reason of my 5 stars) but now, I'm experiencing a problem.
Indeed, I'm on Ubuntu 10.10 with Thunderbird 3.1.7 and the "Latex It" button does not appear when I write a mail.
The configuration is OK (the 3 progs are detected and status is OK) but the button "Latex It" does not appear ! Impossible to use it, then !
How to solve this problem ?
Thanks in advance !

This review is for a previous version of the add-on (0.6.1). 

Please disable all other extensions. Mr tech toolkit and things such as spam fighters are known to cause problems, there are several other threads on the mozilla.dev.apps.thunderbird newsgroup telling similar stories. Please do tell me if that helps in any way, because I haven't been able to reproduce the problem on my side. Thanks!