Fixed the issue - preferences were saved.
It was regression of the commit-id:
533aaa2fa3844220240f41df9af6202dca891756.
Branch
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master
Details
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http://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=0e50f4b1f3be32fa95ca7c6b8eaa14cf97c5b8df
Modified Files
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.../templates/preferences/preferences.js | 6 ++--
web/pgadmin/static/css/overrides.css | 38 +++++++++++-----------
2 files changed, 22 insertions(+), 22 deletions(-)