Frosted glass filter turns layer black
I have previously used the 'frosted glass' in the Filter Gallery intermittently for a specific purpose (depicting jet engine exhaust!) with no problem. Suddenly, after the latest OS and PS upgrades, it doesn't work. It comes up with my regular settings, but instead of making the layer crinkly as expected it simply turns it black, with a few scattered paler artefacts around the edges.
Anyone encountered this or got a clue what's going on?
Gary
Photoshop CC 19.1.1 running on Mac OS X High Sierra.

