The Adobe Forum has provided me with the answer.....in case anyone else has the same problem........... "It has been reported that the problem with Lighting Effects presets are resolved when re-enabling indexing for the Lighting Styles folder. How to check your disk indexing: In Explorer, find the folder in which Photoshop is installed, then find the subfolder Plugins>Filters>Lighting Styles. Right-click this folder, and choose Properties. Under the General tab, click Advanced, then check the box that says 'Index this folder for faster search' (or similar). Reboot and check your Lighting Presets in Photoshop."