Lost Ark has been a great game overall, presumably because it had a few years to iron out all its issues before it launched to western audiences. The game's economy is well balanced and there aren't too many issues with exploits either. Unfortunately, the game is riddled with bots, but the devs are doing everything possible to get rid of them. Meanwhile, another major bug has been tormenting players, and it's unfortunately related to the game's recent content update.
The MMO's May update introduced the Valtan Legion Raid among other activities. While players were delighted with the slew of new content, a number of them were halted dead in their tracks thanks to a game breaking bug that occurred during the raid. As showcased by u/Sagezu on the Lost Ark Subreddit, it seems UI items have been getting stuck to players' cursors, rendering them unable to do anything else unless they quit the game (thanks, Eurogamer).
The number of comments on the post indicates that a lot of players have been facing the same issue. There's been no word by the developer so far, but considering the severity of the bug, and the fact that it affects the game's newest content, you can expect a fix any time soon.
Hopefully, the devs aren't too occupied fending off the legion of bots plaguing the game. Amazon provided an update on the process recently, talking about the improvements made to Easy Anti cheat and Lost Ark's native detection system in order to stem the flow of bots and hackers.
"We know that bots have been causing frustration within the community, and we share in that frustration," wrote Amazon on the game's official forum. "Over the past few months we’ve made a number of changes to Lost Ark in order to combat bots. We know that there’s still work to do, and we want to share some detail on how we’re approaching this ongoing issue so we can give Lost Ark players a better experience."
However it looks to be a long process, which will "require sizable platform and architectural changes to implement in Lost Ark."