Recently, I have noticed that ⌘ + c and ⌘ + v keyboard shortcuts no longer work like they used to. If I want to copy/paste something from Postman.app into Slack.app, for example, the clipboard will only paste what was copied a long time ago inside of Slack.app. It seems like each application now has it's own clipboard and nothing is being shared?
What happened? How can I fix this? I can copy/paste inside an app just fine, but the second I want to paste something from another app it does not work.
I am using a Mid 2015, 15" retina Macbook Pro running OS X El Capitan 10.11.6.