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I had a similar problem before the STU 1, and now (after the STU 2) this kind of problem appears again.
It happens to me too, I had to disable Cascaded Shadow Mapping in order to fix it.
Here you can see that a lot of players have the same problem, one of them managed to fix it by enabling Public Beta 
We deployed a fix for this bug to the public beta branch. Please test it and see if it resolves the issue. After a test it a bit more, we’ll set it live on the main build.
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We have uploaded a patch last week please check again and let us know. Try verifying your game cache once.
Also all the hot fixes from beta have been applied to the main game too.
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Thanks for the update
From those screenshots it looks like CSM is not working for you. We have multiple fail safe in the engine to shutdown CSM if it detects something required for CSM is not supported on the hardware.
That been said you shouldn’t have faced any problems on R9 290 Tri-X.
We are investigating.
We have uploaded a hotfix on steam public beta version yesterday. This should fix any remaining issues with CSM on AMD GPU.
After some more testing we will update the main game too in a day or two.
Let us know if you this fixes your problem.
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