Previx 3.0 blocks Firefox?

Suddenly my Firefox installation stopped to work few days ago on my Windows 7 pc. The browser window didn't show at all, and only a general memory error was issued:

This image shows the full message:
http://www.lucianagallo.com/errFF.jpg

After a complex dialogue in the FF forum (Italian) I disabled Prevx 3.0 and the browser restarted immediately. I fear this is a really important issue for Prevx 3.0. If someone can read Italian this is the link more significant:

http://forum.mozillaitalia.org/index.php?topic=55959.0

or this one, that is my request:

http://forum.mozillaitalia.org/index.php?topic=56018

 

This is discussed in couple of threads just a bit down....
Firefox 14.0.1 and Prevx SOL

If you have a valid PREVX 3.0 license you can ask for swapping it for a WSA (= Prevx 4) license

 

Thanks, and I have a valid license for Prevx 3.0. I sent my bug to the official support: I imagine they will say something. Or I must do somthing special and different for swapping to the new version?

 

Here:
Prevx 3.0 license to WSA license

In other words, better to ask specifically.