Exposure Adjustment Layer unavailable when adding a new image?

I have noticed a change with Photoshop which is effecting my workflow and cannot understand what is happening. Previously I used to drag and image into a new document and then worked non destructively by adding various adjustment layers. Now I notice when I try to do this the exposure adjustment layer is unavailable. Also Black and white adjustment layer is not available. Has anyone else noticed this recently? How do I rectify this?