Hi Dave,
Thank you for this advise.
Please find attached my files:
1) C:\Users\pawelhadam\AppData\Roaming\pgAdmin\pgadmin4.log
I cannot understand why this log file says "Starting pgAdmin 4 v1.5..." as I have installed v1.6 from pgadmin4-1.6-x86.exe
2) C:\Program Files (x86)\pgAdmin 4\v1\web\config_local.py
Thank you and kind regards
Pawel