Hello!
I have a following setup:

As you can see - everything is builded with obsidian. Underlayer is also is obsidian.
All working fine except one thing: sometimes levers on sluices is destroyed!
It looks like pressurised water leaks thru corner to free space. Also i can't catch such moments when i near sluices. Looks like this happens when i'm out and only chunkloader keeps chunks active.

Right now the pressurised water checks all three blocks around it. I can change this to checking the sides.

Thank you for answer!
I also want to ask you another question :)
As i can see in my setup - obsidian is not enough. Is it correct? Pressurised water blocks bottom is also obsidian. And this bottom side periodically destroyed! Is it normal? I was try to google for best suited materials and can't find good solution. No one knows :)

I believe that's because I had a typo in my code, i got it checking y instead of y2 :p, Fixed that ready for a bug fix update later ^_^

Should be fixed in 1.2.1b