[pgadmin-support] unable to restore database

Hi,
i tried to restore a database dump into my local db with pgAdmin4, but 
it fails for no reason.
The only thing the dialog outputs is "Restore Job created", nothing 
happens afterwards nor can i examine if the job is running.
Do you have a suggestion how to use the Backup and Restore tools in 
pgAdmin4?
Environment: pgAdmin4 1.2, Windows 10

Regards, Daniel