The first thing to check is your swatches for the foreground and background colors in the Tools panel. If they are both black, this will be the result. Type the shortcut of "D" to set the swatches to the defaults of B&W and see if it works now.
Thanks again. The standard PS filters do work as usual with no problem. I had been using an updated PS but it got corrupted and so I deleted it and re downloaded it from Creative Cloud app (the full PS version). Not sure if the problem coincided with that. I tried support at skylum but I was told they no longer support Macphun and suggested I buy their new filters.
I’ll try the skylum support link you sent.
--------------------------- Ron Marks, Ph.D., M.P.H., M.S.W. Tulane School of Social Work Dean Emeritus