Daylight Sensor crafting recipe wrong/missing

Please take a screenshot with your mouse hovering over the slabs.

(If they say "Wooden Slabs" and not "Oak Wood Slabs", the recipe will not work. Wooden slabs are left over from an old version, and they can no longer be obtained. If you chop down a new tree, you will get the correct slabs.)

Ahh, yep, they are 'Wooden Slabs'.

Thanks for that, problem solved.