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What to do if you can't log in after patching WoW

Information on error BLZ51900001

Information on error BLZ51901021

Information on inviting your own alternate characters to your guild.

Troubleshooting steps for pixelated or blurry graphics

Troubleshooting error "Unable to start up 3D acceleration" in World of Warcraft

If you experience crashes, blue or black screens, performance issues, or your computer locks up while playing, follow the steps below to resolve these issues.

How to launch multiple WoW clients on the same computer

Troubleshooting for error "Unable to identify version"