MacOS Issues
This is from Oracles Discord announcement.
Hi, Raiders! Here's some heads up on the recent macOS issue.
We're going to fix this problem in the next update. Until then, please, try to avoid interrupting your battles. The thing is that the battle journal file causes problems with the launch of the game, and the game creates this file each time a Battle is interrupted. So, if you cancel the Battle or the game crashes in the middle of the fighting, you may need to delete files in the folder "~/Library/Application Support/com.plarium.raidlegends/BattleJournals" in order to launch the game again.
The next patch is going to fix this nasty bug. Have a nice day and smooth raiding!