Plugin conflict with Ninja Pages, Categories & Tags

Hi

I have recently installed Automessage on one of my sites, http://www.greenwichmums.com but its not been working as it should. New users weren't being queued up even though I had written a series of emails. Have attached a screenshot.

I went through bug fixing and tracked down the culprit, its a plugin called 'Ninja Pages, Categories & Tags' which, if activated, stops Automessage working properly.

The thing is, that site relies heavily on page categories so if I cannot get them to play together, or find an alternative solution to that plugins functionality, then I am going to have to leave Automessage out. And I like it so I don't want to do that.

How can we fix this?

Thanks

James.