PgAdmin 4 v2.0 stuck in "Initializing the query execution!"

[Peterko]

Hello, 
I use pgAdmin 4  - version 2.0 on Windows 10 Professional.
I use SSH tunel to connect PostgreSQL server. In PgAdmin I configure host as 
localhost.
I successfully connect to the server, I can list all tables, schemas, ...
But I cannot run any query, because the query tool stuck in "Initializing the query 
execution!"
 
Thanks 
 
Peter