Sorry for posting here, but the original thread on this subject seems to be locked. I encountered this bug and it is fatal to my game which relies on water being deadly.
I don't know if it's some kind of fluke but I edited the setup.ini file, changing hidelowfpswarning=0 to hidelowfpswarning=2, and so far the warning has not appeared. Can someone please confirm whether this is a real fix?
Julian