Failed to register devices: The operation completed successfully.

What it says on the tin. I get these come up in the console now pretty often. Once they started... Not sure how long ago, keyboard and mouse usage in testing sometimes doesn't work. Sometimes it's keyboard and mouse, sometimes just mouse. As you can guess, this makes it /really/ annoying to try to get my two game assignments due in time.

The controls seem to have no issue if I actually make a build, but that's not really ideal either. Some of the errors have other info attached.

 <RI> Failed to register devices:
 The operation completed successfully.
 
 UnityEditor.EditorApplicationLayout:FinalizePlaymodeLayout()
 
 =
 
 <RI> Failed to register devices:
 The operation completed successfully.
 
 UnityEditor.ConsoleWindow:ShowConsoleRow(Int32)
 UnityEditorInternal.LogEntries:ClickStatusBar(Int32)
 UnityEditor.AppStatusBar:OnGUI()

There's other things like this, but most are just the message in the title. I've already phoned in error reports through Unity, but I've not seen replies. The issue persists across projects as well. Google and searching here comes up with Kerbal Space Program errors and a few other Unity games, but nothing really clear.