This site is not enabled for automatic updates error

I was testing the enabled/disabled on one of my sites in the "Update Notifications Sites" section, but it doesn't let to do the auto updates anymore for that site. I get the message:

This site is not enabled for automatic updates. You may change which sites are enabled or upgrade to a higher membership level here »

But my current membership level lets me enable up to 1,000 domains and I only have 12 listed so it should be able to let me.

I thought maybe if I delete it from the list and log out and back in of site, it would show up fine again, but it hasn't so appears to be a bug in the WPMU DEV Dashboard coding.

Cheers, Ian