MMR Issues

There was indeed a bug with MMR calculations when Patch 5.4.7 was first released to North American servers. We were able to isolate the bug and apply a hotfix for it before the patch was released in other regions, but unfortunately are still a small number of players on the North American ladder who were able to gain some unfairly high ratings before the hotfix could be applied to NA servers.

Fortunately, we've since been able to correct the issue, and affected players should start to see their ratings fall in line with where they should be as they continue playing matches. Furthermore, should a player choose to sit on an unfairly high rating in the hopes of earning end-of-season rewards they would not have otherwise qualified for, we’ll be able to adjust those ratings individually. Otherwise, it’s completely safe to continue playing as normal without fear of any upcoming actions negatively affecting your rating.

We don't think this situation calls for a rating wipe. We were able to fix the bug quickly enough that only a very small number of players were affected, and those that were will see their ratings stabilize before long. Those that choose to sit on their ratings, we'll be able to correct manually, so there's no risk of long-term damage to the ladder.

I totally understand why it's frustrating in the short term if you're one of the few players who were affected, and we apologize for that. We just don't think it's fair to the vast majority of unaffected players to do a wipe, when there's nothing wrong with their ratings at all.