The error with bad Keccak shares still exists in 11.9:
Command line used:
EthDcrMiner64.exe -mport -4000 -epool daggerhashimoto.eu.nicehash.com:3353 -ewal *********************************.multipoolminer -epsw x -allpools 1 -allcoins exp -esm 3 -dcoin keccak -dpool keccak.mine.blazepool.com:5133 -dwal *************************** -dpsw ID=multipoolminer,c=BTC -dcri 20 -dbg 1 -logfile debug.log -platform 1 -y 1 -di 0
...
ETH: 11/17/18-09:35:33 - New job from daggerhashimoto.eu.nicehash.com:3353
ETH - Total Speed: 7.424 Mh/s, Total Shares: 0, Rejected: 0, Time: 00:01
ETH: GPU0 7.424 Mh/s
KC - Total Speed: 222.728 Mh/s, Total Shares: 8, Rejected: 5
KC: GPU0 222.728 Mh/s
KC: 11/17/18-09:35:34 - SHARE FOUND - (GPU 0)
KC: Share rejected (203 ms)!
KC: 11/17/18-09:35:40 - SHARE FOUND - (GPU 0)
KC: 11/17/18-09:35:40 - SHARE FOUND - (GPU 0)
KC: Share rejected (203 ms)!
KC: Too many rejects from pool, disconnect...
KC: - connection in 20 sec...
GPU0 t=59C fan=25%
KC: Stratum - connecting to 'keccak.mine.blazepool.com' <162.243.150.48> port 5133 (unsecure)
KC: Stratum - Connected (keccak.mine.blazepool.com:5133) (unsecure)
KC: Authorized
KC: 11/17/18-09:36:05 - SHARE FOUND - (GPU 0)
KC: Share rejected (203 ms)!
KC: 11/17/18-09:36:15 - SHARE FOUND - (GPU 0)
KC: Share rejected (203 ms)!
ETH: 11/17/18-09:36:19 - New job from daggerhashimoto.eu.nicehash.com:3353
ETH - Total Speed: 7.382 Mh/s, Total Shares: 0, Rejected: 0, Time: 00:01
ETH: GPU0 7.382 Mh/s
KC - Total Speed: 221.474 Mh/s, Total Shares: 13, Rejected: 9
KC: GPU0 221.474 Mh/s
KC: 11/17/18-09:36:21 - SHARE FOUND - (GPU 0)
GPU0 t=60C fan=25%
KC: Share accepted (203 ms)!
KC: 11/17/18-09:36:22 - SHARE FOUND - (GPU 0)
...
It happens with NVIDIA and AMD cards. I tried both.