Several blog post back, I mentioned some issues getting solid communications between my YN622C-TX wireless flash transmitter and a YN565EX flash. Since then, Yongnuo has released an update to the 622C-TX firm. Version 1.07 of that firmware may be found on the Yongnuo site: http://www.hkyongnuo.com/e-detaily.php?ID=348. In my initial tests, the 1.07 update seems to have corrected the connectivity problems I had with the 565. For those using the 622C-TX, you may wish to consider updating your firmware.