Earlier this year, Meetup announced a major revision to their integration API. The new release, version 3, will be mandatory starting August 15th. JFBConnect has been updated to support all of the changes required for version 3 for a seamless transition. If you use Meetup integration with JFBConnect, please make sure you are running at least JFBConnect v8.2.3.
Even if you don't use Meetup yet, one change to their API to take note of: After August 15th, you'll need to have a Meetup Pro membership to add Meetup Authentication to your site. Before August 15th, you can signup as an "OAuth Consumer" without being a Meetup Pro member and you will be able to continue using Meetup integration for free!