Patch 27.4 is now live and Yogg-Saron is unleashed from his prison in the new 38-card Fall of Ulduar Mini-Set! Follow this page for updates on issues we’re tracking with this patch.

The following are some of the known issues we’re tracking this patch:

• [Added 9/19] We’ve received reports of antivirus software flagging “audioplugin_fluxer.dll” as malware. This is a false positive that has been submitted to the antivirus vendors for clearance. The file can be safely restored without risk and we are working to clear the flags as quickly as possible.
• [Added 9/19] The team is investigating an issue with Battlegrounds games unexpectedly hanging. Maiev has (ironically) gone dormant and is temporarily unavailable as a Hero until a fix is found.
• [Added 9/19] Some Hearthstone anomalies have unintuitive interactions with Start of Game cards such as Prince Renathal. The team is investigating the issue.
• [Added 9/19] Player records may not be visible in Duels games. The team is investigating the issue.
• [Added 9/19] Some Duels Hero Powers are visually incorrect in hero selection. The hero powers should work correctly in game and the team is investigating the issue.

We’ll continue to update this post as we get more information.