hi,
My mistake - my breadboard is full of wires so I missed that one in the drawing - I have the resistor as you describe so my drawing is wrong. I copied the setup from an analog input tutorial and it works: values change when I cover the LDR or not.
My issue is that my digital out is not switching the inputs. When nothing is connected to the board I get my 0v or 5v on the digital out pins where needed. When I hook up the sensors and multiplexer to the board voltage is dropping and the chip does not switch. No matter what I do it keeps reading input 1 which is all address pins low and the Enable pin on high (but that one is hardwired).
Jhh