Hi James,
Sorry to hear about your accident. Happy you are doing well now. You and your wife couldn't have been any nicer or helpful when we meet . Backscatter has my system and they are working on a solution. They are going to test All options first and then make a new recommendation. They have been absolutely great in their response and handling of this issue.
Steve, please provide an update with the results and recommendations from Backscatter, if only a PM. I know that is frustrating, going on a trip to have your expensive camera not work as expected. I am trying to get mine in the pool again but I want to wait for the new TTL trigger. I am still some ways out from our next trip so have a little time. The A6400 works fine with the onboard strobe as trigger, but works even better, faster and less battery drain (in theory) with the trigger. I have been thinking to purchase the Nauticam trigger (used for the NA-6600) and take it apart and reconfigure it to work with the NA-6400. Just as a back up trigger. May need to have a Plan A, B, C and D .
Oh, thanks, I am 100% (crazy)!
James