On the XMP dropdown menu... No. I had that set to "Lightroom Defaults". But I tried resetting it to "Adobe Bridge" and restarting FRV. It made no difference. The Alt+Backspace combination does not change the rating. What it does (instead) in the Grid-view is move the focus from the current thumbnail to the furthest thumbnail on the left of the current grid row. That is, it behaves like a "CMD+LeftArrow" would in a word processor (an many other Mac OS interfaces).
On the XMP dropdown menu...
On the XMP dropdown menu... No. I had that set to "Lightroom Defaults". But I tried resetting it to "Adobe Bridge" and restarting FRV. It made no difference. The Alt+Backspace combination does not change the rating. What it does (instead) in the Grid-view is move the focus from the current thumbnail to the furthest thumbnail on the left of the current grid row. That is, it behaves like a "CMD+LeftArrow" would in a word processor (an many other Mac OS interfaces).