I am not having the problem, but a similar issue was (and still is) widespread in Hearthstone on MacOS. There’s also apparently an issue with the mage tower flail appearance if it is transmogged to any character which appears on your Warband login screen.
- Hearthstone issue: https://us.forums.blizzard.com/en/hearthstone/t/hearthstone-stopped-working-on-mac/130322
- Flail transmog issue: Game Crashes Going to Character Select Screen (Mac) - #3 by Jarsus-malfurion