I got that problem as well several times during the day and several things worked to get back on the game again. You should try this before start removing addons, or re-installing etc.
When starting the battle.net and then world of Warcraft, do not click on other stuff until you are logged in proper!
- Run the battle.net as Administrator.
If it doesn’t work - Restart your comp and then battle.net. Then start worldofwarcraft
This worked for me, but may not work for you. But, I really hope it does so we can enjoy this awesome game!
Other posts
- Myth Gear levels changed in The War Within
- TWW Season 1 Mythic plus ilvl Rewards from Dungeons and Great Vault
- When EVERYTHING comes out in The War Within
- 500+ ilvl!! FASTEST and BEST WAY To Gear up ALTs in PRE-PATCH
- 6 IMPORTANT things on 11.0 PRE-PATCH you do NOT want to miss
- All Currency Sharing in Pre-Patch WoW
- An extra Enchanted Runed Harbinger Crest for each charater
- Severed Pact
- Tier Gear Vendor in the War Within
- Unlock Both Alliance and Horde Remembered Mounts with Just One Purchase