Ok, so i think you heard a "dling-dlong" message when a ping-pong is completed right?
And then if you go to the General Gain tabs you don't see any log? But the same gain is written in the GAIN Log.TXT File?

If yes, send me the error_log from the CATSystem/Exchange folder. You can upload the file or copy/past in a pm message if file is not too big.