The Ning Import module is now at V1.1.17 and has had the check for 'Un-approved' items in the archive removed as this has turned out to be another Ning anomaly. It seems that if a Ning item is set to 'un-approved' in the archive it still shows on the Ning site so needs to be imported.
Affected items are Blogs, (global) Forums, Groups and Discussions.
So if the Ning Import for these items is run again, using the 'Create Only' option, you may recover some missing items.
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Paul Asher - JR Developer and System Import Specialist
updated by @paul: 03/07/15 10:16:39PM