Shortcuts for toggling layer visibility no longer work

Regarding the toggling of layer visibility...I'm able to singly toggle a layer visibility on/off.  But the following other common shortcuts stopped working:

• Option -click (Mac) |  Alt -click  (Win) the eye icon in the Layers panel to toggle visibility of all other layers.
• Command + “,” (comma) (Mac) | Control + “,” (comma) (Win) toggles the visibility of the currently selected layer(s).
• Command + Option +  “,” (comma)  (Mac) | Control + Alt +  “,” (comma)  (Win) shows all layers (regardless of which layers are selected).
• Control -click (Mac) | right -click (Win) the eye icon and select “Show/Hide all other layers” to make all layers visible (regardless of which layers  were previously visible).

Very frustrating as I'm no longer able to toggle groups of layers.  And I have very large numbers of layers (200+).

Any solution?