I am running the client on OSX 10.12.5, I happened to click on the blue "pgadmin 4" text top left in the menu bar and the dialog that displays is blank:
Version1.5 CopyrightCopyright 2013 - 2017, The pgAdmin Development Team Python Version2.7.10 (default, Jul 30 2016, 19:40:32) [GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.34)] Flask Version0.11.1 Application ModeDesktop Current Userpgadmin4@pgadmin.org
Cheers, Alan -- Alan Barrington-Hughes Software Architect Quality & Regulatory Development