I am running 1.9.2.2 and when I set a catalog price rule I get nothing in the front end.

I flush the caches, I re-compile, I manually delete /var/cache/* and I've tried reindexing the product prices... Still nothing. In the DB I can see the catalog price rule in the mgwp_catalogrule table but there isn't anything in the mgwp_catalogrule_affected_product table...

Do I need to run a cron job that i don't know about or something...?

Any help appreciated - this is killing me ;(