There's a wide range of platforms to choose from but only a select few have a Ning Import Tool readily available. This article will focus on BuddyPress, Jamroom and SocialEngine PHP because I think they're the best options currently available for those looking to migrate from Ning. Please see the table below for information on data import capabilities for each of the platforms listed above.
Catching issues as they happen makes finding a resolution to a problem a lot easier but problems can sometimes go unnoticed for extended periods of time and that can make it real difficult to find the source. When this happens, work backwards and undo any and all recent changes to see if the issue goes away.
In this video I discuss some of the basic factors that should be considered before choosing a Social Web Platform.