Hi !
Long life to boost ;-) !
Ok, I got boost working, but now I'm facing the folowing problem

/fr/objets/small?f[0]=field_rubrique%3A1

or

/fr/objets/small?f[0]=field_rubrique:1

is created as 

fr/objets/small_f[0]=field_rubrique%3A1.html

but not served
I wonder if one of the special character ( [ ] % : ) is not perturbing htaccess rules .

Any idea ?