PgAdmin4 problem with connect

I just tried to use the actual Pgadmin4. Version info is:
***********************
Version1.4
CopyrightCopyright 2013 - 2017, The pgAdmin Development Team
Python Version2.7.12 (v2.7.12:d33e0cf91556, Jun 27 2016, 15:19:22) [MSC
v.1500 32 bit (Intel)]
Flask Version0.11.1
Application ModeDesktop
Current Userpgadmin4(at)pgadmin(dot)org
***********************

When I try to create a new server (which can be used by PgAdmin3 with no
problems), I get the error message:
"Error saving properties: GONE - 'ascii' codec can't encode character
u'\xbb' in position 45: ordinal not in range(128)"

When I uncheck the box "Connect now?", I can save the new server, but when
trying to use the new server, I get the message (at once): "Connection to
the server has been lost."

So I cannot use the actual PgAdmin4. I had the same problem with earlier
releases of PgAdmin4.
The databases I try to connect to are version 8.4. Is this the problem?

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Viele Grüße

Walter Willmertinger