As you can see from the title, spectator mode (or watching replays) doesn't do what it is supposed to since the most recent patch.
There is a window (by default brought up by pressing 'i') that allows you to select and deselect windows as:
2. Time Controls
...and a few more
You can bring up the window, but clicking in the boxes to select/deselect an option doesn't work.
Hopefully this can be fixed soon!