When I bought the Canon 100S a few years ago I kept my Epson XP-960 for B&W non-photographic print jobs.
Yesterday it refused to let me print because the Yellow ink was out ... and I have printed exactly no colour jobs on it since switching (or certainly none in the last year).
Now I know that B&W printing does not mean that only the black ink is used (I think I read somewhere that this is the cause of blue and magenta casts) but it's hard to see where "out of yellow" fits here.
Any ideas?