It seems to be a problem handling RAC - i had to make a custom query to go against gv$session in order to see sessions on both nodes. The sql text is not appearing for the node i am not logged in to. The workaround for now is I log into each node separately and view sessions that way. I can see the sql text, but it's a bit tedious to have 2 windows open. (esp if we expand to more nodes in the future)