I saw a lot of interest in the topics about the D2x erratic flash problems with the Subal housing, but I see many people are hesitant in trying to remove Subal's hotshoe pins, or cutting the green wire as Alex suggested. I then decided to be the Guinea pig and removed the pins from the hot shoe of my Subal following Dave Marsh's (from wetpixel's sponsor uwphoto.com) directions, thanks Dave! Here is an account of how easy it is.
The problem: The D2x in Subal housings would erratically not fire the strobes or not save random images to the memory card. This is true for Subtronics and Sea&Sea strobes, but appears to not happen with Ikelite strobes.
Tools necessary: one small screw driver.
1) Remove the three screws from the top cover:

2) Remove the two screws from the circuit board:

3) The springs hold the pins in place, when you remove the circuit board, simply turn over the bottom plastic part of the hotshoe and the pins will fall. Be careful, they are small and you may lose them. Do it over a table or flat surface. Here is the bottom of the circuit board:

Here is the hotshoe open without the pins:

And here are the pins:

I decided to remove only the ready light pin, as shown below, and kept it in a safe place just in case some company decides to produce an iTTL UW strobe. I kept the other pins in the hotshoe to ensure a snug fit of the hotshoe to the camera.

I know I've pointed many of you guys to Ikelite's site, but according to Ikelite's instruction you need to cover the monitor pin, and that pin is already disconnected in a Subal with a 3 pin connection. So this is the real fix, and Ikelite's fix won't work for other strobes.
This was very easy and the entire process took less than 5 minutes. I recommend it even for the ones that are not very comfortable using tools.
Luiz