I was one of the quietly happy 1.6 / 1.6.1 users for the first few days. Then I began having a problem rezzing water.
If there was an event I can associate with the start of this problem, I can only think of when I started travelling to the new continent with a jetpack from Purple.
See attached picture for a snapshot of what I'm seeing. The only other time I've seen something look like this is when I set landscape detail to zero in the settings. But instead of looking like this for a few minutes, it usually stays like this for the whole session.
It shows up where I spent most of my time which is in Kiha and Nuttal (new continent), so it may be in every sim or just these few.