Blender Version
Broken:
blender-2.80.0-git.925380050d0-windows64
Short description of error
Left-Click Select isn't default as stated in https://wiki.blender.org/wiki/Reference/Release_Notes/2.80/UI
Exact steps for others to reproduce the error
Download and extract https://builder.blender.org/download//blender-2.80-925380050d0-win64.zip
Run Blender
Left-Click Select is not enabled