Hi SeaYoda
The problems you enountered were 2 issues I had with my 10Bar housing Prototype. These issues were very easily fixed.
1. The Aperture/Shutter Speed button is a push and twist button, when it is twisted it locks in the lower position. But it wasn't the correct height (too short) on the Prototype, so I simply removed the slide-on rubber cap (inside the housing) and dropped a small piece of plastic inside the cap and refitted it. This stopped the cap from sliding on to the shaft quite as far and it then reached the button on the camera when pushed and twisted. This then holds the camera in shutter speed or Aperture adjusting mode (whichever way you want your camera menu programmed).
2. The Turn-dial on the rear of the housing also didn't reach the dial on the camera on my Prototype, it had to be pushed in to reach the camera dial. I figured it didn't need to be spring-loaded at all and advised 10Bar of the correct dimensions. 10Bar sent me a new shaft and rubber which was not spring loaded, with a different type of rubber and it touches the camera dial all of the time, now it just needs to be rotated to select Aperture/Shutter Speed and the front push-button is pushed down and rotated to hold the camera in the opposite function (as per 1. above it is pre-programmed by the user as to which function is available all the time and which is available by pushing the forward button and rotating).
10Bar assured me this would be happening with all production model housings, I really don't know who builds the Fantasea product, but perhaps they didn't get any testing carried-out or didn't get the feedback as it sound like the mods hadn't been done to your housing??