Water and ice not working with filter in place, works with filter out.

Our fridge suddenly stopped making ice and dispensing water. As usual, I assumed it was the filter (near time to replace). I took the old filter and put a new one in, and nothing: no water dispenser (you CAN hear the valve working) and no ice fill.

Many forums refer to the filter as being bad - we tried the new filter, and it does not work; however, the interesting thing is that the water comes out fine if you take the filter out. This problem seems localized to the mechanism inside the fridge where you load a filer.

I do not believe it to be the inlet valve assembly, or the water would not flow freely with the filter out.

Model # wsf26c3exbo1

Any thoughts?