4
msdana, thanks for your suggestion.
I actually thought the same this morning and upgrade to the new module without success.
But, I've finally found the problem.
It seems that in previous version, there was a function.php file in newbb folder, but no, there isn't anymore.
Maybe I miss a read me file the last time I upgraded and at that time maybe I didn't check it the forum was working correctly.
Now, it seems to be working!
^_^.