That sounds like a few days ago where I did an hour of work on the temporary art file and then went to cut and paste my progress in the temporary file over my "last good file" and when I accidentally told it "no I don't want to overwrite"...losing the progress made... Forever. :C
I'd had the sketch done already at least *thank goodness I don't have to redo that* but I'd gotten all the inks done and I was almost done with flatcolors and it just closed on me with no warning.
Oof. Been there, done that. There was a time when my streaming software ocasionally caused my photoshop to crash, and if I forgot to save, I would lose everything. Lost a lot of good sketches that way.
I'd had the sketch done already at least *thank goodness I don't have to redo that* but I'd gotten all the inks done and I was almost done with flatcolors and it just closed on me with no warning.
Inking is the worst part... Sketching goes by so fast...
Sorry if that happen to you.