You might be in a raid group! We also have some other steps to fix this issue.

Blizzardコンテンツのトーナメント方式に関する情報

How to make a copy of one of your characters in the Public Test Realm and the Beta client

The WoW Token allows players to purchase World of Warcraft game time for real money and then sell that game time for gold on the in-game auction house.

Information on the Diablo III starter edition. 

Troubleshooting black screen crashes in Heroes of the Storm

ディアブロ・イモータルのドロップ率に関する情報

Troubleshooting steps to help you connect to World of Warcraft

Troubleshooting steps for resolving lock ups in Diablo III.

Diablo III Supported Video Cards