logic pro X full-screen quick look preview not working

Logic Pro X full-screen Quicklook preview not working with Option-Space bar anymore (believe it or not, it DID work before).

I know that just using the space bar gives me a thumbnail view (and clicking on the "quicklook" symbol in the files window gave me the desired result), but the method mentioned earlier is a "step-up" on that.

Does anyone know how to get the full-screen option back?

• Jim.