I'm also having this problem but this is like my first night with the monome.
I'm finding that some of the effects don't recognise the Grid. Flin is the main one of these that I'm noticing. All others are intermittent.
I tried Sum which worked, including Flin so I know the monome works.
When I tried with the Ableton Push connected, all effects lost the ability to see the Grid.
I'm running Live 9.5, Windows 7, varibright 128 (currently sold Grid), and whatever the latest serialosc is. I assume 1.4