v1.16 has a overflow bug if the intensity is too high dynamic -1 for AMD. This bug was fixed in v1.18.
The fix is to set --xintensity 78 or similar, or upgrade to v1.18.
v1.19 ready soon. Testing now..
I upgraded to 1.18 as you can see in the screenshot, but still getting the error for the DAG file verification. The difference with the 1.16 in my case is that before the DAG verification was the only error. Now with the 1.18 after getting the DAG verification error, when I restart the miner 2 cards get recognized only 3GB on 8. Restarting the miner didn't work, neither with a different miner, I had to restart the rig to make another miner working again.
Can it be because I'm CPU mining with cpuminer-opt?