remove the plastic injector tube that goes through the back wall of the fridge, the valves can leak slightly right after a filter change, this slight leak with no real pressure behind it will cause the small amount of water to freeze in that tube blocking the water fill to the ice maker
you twist the tube to unlock it, then it pulls out, try to blow through the tube, if its blocked thaw it with some hot water and reinstall
if this tube freezes repeatedly you will have to change the water valve
post back if you find that tube was not obstructed