NFA 5 beta - IP Groups Question

NFA 5 beta - IP Groups Question

I am trying to configure an IP Group to represent a complex site with lots of networks. After adding around 15 networks into the group, I start getting a Page Cannot Be Displayed error when I hit the Add button. A browser refresh gets around this. Once I hit 20 networks, I can't seem to go any further - hitting the Add button shows a brief 'Done, but with errors' message in the browser status bar but it does not add any more networks to the group.

Is this limit of 20 networks in a Group is a feature or a bug?

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