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I have been having some Sea&Sea issues . I bought a pair of YS-D1's as my first set of strobes and after about 5 uses, the one just stopped switching on. Tested all and eventually contacted Manex Marine, the agents in South Africa, and sent it back to them by courier. Apparently they would send it to Japan fro investigation, repairs or spares - This was in November 2015 , since then not a peep from the agent or Sea&Sea. I ma currently following up with the agent but no answer yet.. A Deadly silence. I bought a Ys-D2 as a replacement as immediately as I was entered into a shootout the week after the YS-D1 failure and needed a strobe. I was syncing by sync cord and I must say that all the upgrades on the YS-D2 makes it such a great flash and a pleasure to use. Gone is the constant angst about moving a switch by accident and missing a shot when it counts. The colour coding on the settings and the ready beep also works great for me. However I had since had a small flood into my Hugyfot housing due to a failed O-ring on a bulkhead and the sync board in the Hugy housing is beyond repair. My Canon 40D and lens were not harmed, thank goodness. I then switched to dual fibre optic while I am waiting for a replacement card to arrive from Belgium. Now the problem: Setup: Hugyfoy Housing with optical pickup through bulkhead. Fibre optic cables from camera housing fibre optic pickup ( just a perspex plastic capsule through a bulkhead, no electronics, to a YS-D1 and a YS D-2. Camera Canon 40 D Settings: Manual, shutter speed anything from 1/50- 1/250 aperture from f2.8 -f32. Flash assist on camera is off. YS-D1 setting manual - no pre flash YS D2 setting Manual - no preflash - green mode When I trigger the camera, both flashes trigger but the YS-D2 does not have any effect on the image as if it does not sync. Switch off the YS-D1 , the YSD2 triggers with the fibre optic, but does not have any effect on image. Connect the YS-D2 via fibre optic to the optical output on my YS-D1 and problem remains the same. If I switch to manual with pre flash and make sure that the pre flash mode is set to factory default, the flash triggers at full power outset and the image is overexposed, as expected. In neither of these modes do I have any control over the output power via the Light output dial. WTF am I doing wrong or am I reading the manual wrong ? Please help.