I just build a new rig today, R9 280x and a fresh driver Adrenaline 18.5.2. Now this happens:
C:\Claymore>NsGpuCNMiner.exe -pow7 1 -xpool ssl://us-east.cryptonight-hub.miningpoolhub.com:20596 -xwal account.worker -xpsw x
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║ Claymore's CryptoNote AMD GPU Miner v11.3 ║
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XMR: 2 pools are specified
Main Monero pool is us-east.cryptonight-hub.miningpoolhub.com:20596
C:\Claymore>
What might be the reason?