[mgkimsal]

Had to use workspaces on a client project a few months ago. There was some bizarre issue between El Capitan and the remote desktop which would send most of my keystrokes to the remote instance, even when the focus was not on the Workspace window.

I'd somewhat narrowed the behaviour to any 'messaging' system - slack, skype, messages and some others - if I switched to slack or responded to an osx 'messages' notice, my keystrokes would also be sent to the Workspace, and generally cause havoc. I'd leave an IDE open, switch to slack to talk to the client, come back, and all the code was replaced with our conversation.

There seemed to be reports of some similar behaviour with a windows client last year, and it was supposed to be 'fixed', but I never saw any reports of similar OSX behaviour.