I used RaveOS 1.0.21 with Claymore 15 and I got error
GPU5 - not enough GPU memory to place DAG, you cannot mine this coin with this GPU
I found that upgrading to latest RAVEOS meaning to 1.0.24
fixed the issue.
Now mining properly.
You will end no option to in the next days... or for example not more ETC after today... I recommend you to go to a miner with development that also support Nvidia and AMD... You can have a look to lolMiner is working great and was one the 1st to have ETCHash adapted..