No entries in og table

After setting up OG fine initially I have now run into a problem where the og table in the db isn't getting any entries when I create a new group. It has two dummy test groups that I created but nothing since I have created a bunch of real group nodes. The og_membership table is filling up fine even getting a gid which I presume is the id of the group entity that would normally be populating the og table but alas, nothing in og.

I've looked through the code to try and debug this but I can't even find the code that is populating this table. If nothing else can someone point me towards that and I can try and trace it back from there.

Thanks