This is a bit weird, a lot 'bloody infuriating'!
I have just been working on some photos taken yesterday afternoon/evening. All has been well, 'til the last one I was working on. A few subtle changes - curves, sharpening, a crop & then to edit with Silver Efex Pro. Again, all seemed well, but on saving the image from Silver Efex Pro, it remained resolutely colour, not B&W, and then simply disappeared, original Raw file & all. It's just gone. Various searches have delivered nothing (including searching by file number in Spotlight), it isn't in the Aperture 'Trash', isn't in the desktop 'Trash'. Just gone.
Anyone experienced anything similar? Anyone any good ideas for retrieving the photo?