At-Large Recorder 2.0 can record from SlingPlayer 2.0 if your Slingbox is correctly setup for remote internet viewing.
Just make sure that your router settings are correct and that you have the latest version firmware for your router installed. After upgrading your SlingPlayer software and Slingbox firmware, make sure that you re-run the SlingPlayer setup wizard and network assistant. Your router settings must be setup successfully for remote viewing in order for At-Large Recorder to work properly.