I tried renaming … didn’t work for me, unfortunately 
UPDATE!!!
I found a solution that worked for me!!
1- Go to your game folder > WTF > and open the Config.wtf file using a text editor
2- Manually write the following line at the very bottom of the file:
SET realmname “Normal”
and click save
If you are not on a Normal server, type PvP, Roleplay, or Hardcore instead …
Try it out and let me know! ^^