After seen lot of people having problems now with Claymore, and the big crash of yesterday I have made an easy table of how to continue mining with another miner, that is able to mine with Nvidia and AMD.
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or just switch to PhoenixMiner_5.3b_Windows , you basically can use the same Start.bat file , replace
EthDcrMiner64.exe to PhoenixMiner.exe and change the tag before your wallet address from -ewal to -wal .
If you are on windows you should run the miner program as a admin first ...