BUG #15496: The application server could not be contacted

The following bug has been logged on the website:

Bug reference:      15496
Logged by:          Carl Rylett
Email address:      carlrylett@yahoo.co.uk
PostgreSQL version: 11.1
Operating system:   Windows 10
Description:

Just trying Postgresql first time. Downloaded v11.1
Error 'The application server could not be contacted' on starting
pgAdmin.After searching I find I can resolve by deleting content from
C:\Users\{username}\AppData\Roaming\pgAdmin but I have to this this every
time when restarting pgAdmin
Note I have looked hard to find a way to submit a community question but
this is not obvious.
Regards,
Carl