Can't use Gizmo's in any view but camera view This seems to be a new bug with Blender 2.79. I've personally never had it happen before and now it's happened twice in a very short period of time.

For no apparent reason, my gizmos (translate, rotate, scale) will stop being selectable in any view but camera view.

Going into the camera view by pressing Numpad 0 will allow me to use the gizmo's but as soon as I exit camera view, I can no longer use them.

This has happened with two files so far and to continue using gizmo's I've had to append the objects in that file over to a new file. I've tried numerous things to try to restore the gizmos but have had no success.

Have I managed to accidently press some key which is stopping me from using gizmos or is this a bug?
It just happened to me (not first time) and I've found the issue.

I don't know why, but you only have to uncheck Lock to Cursor on 3D View's Properties Tab. You may accidentally checked it.