A lot of compute errors with last version, Rx 580.
About half of hashes are errors in V8, I was using 1.7.0 so not tested the ones between, never had a error with 1.7.0
Are you using the latest release of 1.7.4 that has a time stamp of 12/27/2018 10:30PM for the exe?
Because that is what the problem was for me. The original releases did not find shares for my RX470s.