I would have to say that I was jazzed about going there in the first place. How exciting to go check out all the great accessories and all things Mac. Genius #1 was great, very cool guy. Maybe in a year or so, the memory will fade and I will feel up to visiting them again.
It is funny now, but only because I found someone who would not refuse to service my Mac. If I had not found someone, I would still be with a dead Mac for want of a stupid and replaceable logic board.
Sometimes I think it is just the times we live in. Any powdery substance makes people squeamish and/or over-reactive.
Which grain type did you select from the drop-down menu. If you selected stipple, it will make it B&W. Otherwise, I don't know why you're getting that effect. Honestly, though, I tend to avoid raster-based...