Just to inform that with 1.8 it is still impossible to display monthly and yearly stats for me (daily and weekly are fine).
PHP Version 5.3.10 Linux serveur
My trafic is more or less 3000 visits/day and 1.000.000 pages/month
I’m on a mutualized server, so I don’t have acces to server configuration files to increase memory limit.
I was phpMyVisit user and with the same trafic on the same server I never got this problem…