[m-Que]

Tried to use displacement along with clipmap.
Used the same map for displacement and clipmap both:

Result:


Any ideas what went wrong?

[tokiop]

you can try to use texture filtering, it helped me a bit in such case.. Or you'll have to make the clipmap's circle a bit wider (if you want to see the sides)..

[m-Que]

Found a problem:
There was some grey ring left from selection in PS. As a result Maxwell was trying to connect height values on a very small spot. You can see the ring on the bottom of the render.
Sorry for that.
Thanks for advice, tokiop

Anyway, turns out that displacement/clip combination is very sensitive and tricky stuff.