Trouble with Gravity Hull Designator

I just downloaded the Gravity Hull Designator addon via SVN but now when I go underwater the screen turns to pink and black squares. Anyone else ever have this problem and find a fix for it? Thanks

a+ thread

thanks,
seriously though, I need some help with this. nothing on it in google and it’s not in the known list of bugs
and i’d like to make a submarine or use this with boats