Same here.. Seems to have happened after using -rxboost 1 while trying different -strap values. My RX580 hangs after starting the miner now. In fact, it hangs with any other miner as well. Tried -driver uninstall, and the driver was apparently uninstalled, but the card still hangs. Not sure what to do now.
Guys.. for the record, this turns out to be unrelated to Claymore's miner. My USB riser died while I was testing this version, and I didn't realize that right away, as Windows seemed to still see the card but saying that the card was reporting problems. I verified the card works well on another machine and narrowed it down to the faulty riser. Sorry about the noise.