Does anyone else have the same problem? 
Yeah. Same problem here.
Yep. Same problem here.
Yeah. Same problem here.
Hello everyone,
This issue can happen when the Battle.net application fails to connect with the Blizzard update agent which is required to launch our games.
We have an article with some troubleshooting steps that can solve the issue so you can try them to see if it helps:
Hope it helps! 