Are you selecting in the filmstrip or in the grid? Are you in Library or Develop?
I am working in grid mode and (therefore) am in the library tab.
Also, do Help > System Info and report the exact version of LR you're running. (LR CC doesn't always keep itself properly updated.)
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Some initial troubleshooting steps:
- If your current version of LR isn't CC 2015.10.1 / 6.10.1, update to that version.
- Make sure the Metadata panel's current tag set is set to Default. There used to a be a severe performance bug that slowed down selection when other sets (e.g. EXIF or IPTC) were selected, but that was fixed (at least for most of us) a long time ago. Maybe the bug has come back.
- Reset LR's preferences: https://www.lightroomqueen.com/articles-page/how-do-i-reset-lightrooms-preferences/ . Sprinkling that magic fairy dust often fixes things when LR goes wonky.