Sieve not getting recompiled

Hi

I have

     sieve = /mails/%d/%n/sieve/roundcube.sieve
     sieve_after = /mails/sieve/after.sieve
     sieve_before = /mails/sieve/before.sieve
     sieve_dir = /mails/%d/%n/sieve/
     sieve_global_dir = /mails/sieve/

But sieve scripts are not compiled and not executed

It was working until I removed the setting "sieve_global_path"

Something I dont understand ?

Thank you