You know me, Martin, I tried this, too.
I went through
every setting I could imagine. Every tab to do with objects, renderers, atmospheres, everything.
I've Just tried this 'no detail' option again to confirm it in my own testing.tgd, guess what? No positive result again. I still have the problem.
I'd already tried all the ray detail region options settings, from no padding, to full padding in every region selection.
Tried object displacement tolerance settings - sphere, planet, background(because they are also reasonably new additions), obviously there is no displacements applied in default objects but, hey, the setting is still new, so... Still no success.
Other renderer options - AA blooming, MV/detail Jittering, max/min threads, AAARRRGGGHHH!!!
I've been pretty meticulous in every tab. I'm getting pretty wound up with it now, ha!
I'm attaching my own water trans1.tgd, I'd be grateful if you could have a look. If you've managed to solve it in your own .tgd(that I'll download after posting this to check it, too), then maybe you can see where I'm going wrong in mine...
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I'm off to open your .tgd, I'll report back in a bit...