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Last night, Blizzard made the unusual move of disabling D.Va from all Overwatch game modes on the PC. This was a result of a bug that Blizzard has since patched up. D.Va has been brought back to active duty in all game modes.

Details on the bug were outlined by Blizzard through Battle.net.
Following the release of today's 1.10.1 patch, we've seen a significant rise in the number of reported client crashes. Based on our investigation, we've determined these crashes are very likely connected to D.Va's presence within a game.

Due to the impact of this issue, we have temporarily disabled D.Va in all regions on PC, PlayStation 4, and Xbox One as a precaution while we continue to troubleshoot. We don't have an ETA to share right now for when D.Va will again be playable, but this is currently our top priority and we will be sure to provide updates in this thread as they become available.

Two hours after this initial announcement, Blizzard updated with the good news.
Hey folks, thanks again for your patience while we addressed this issue. We've been able to make a fix for the problem and D.Va is now enabled in all regions on PC, PlayStation 4, and Xbox One.