Unussual black spots appearring on upholstery

Could be heat from sitting in the sun with the cover touching seat back tops (unless garaged) or a reaction from waterproofing the cover...

I've waterproofed mine a couple times, and don't have this issue. Seat back tops look like new still (2012), but mine is trailered and garaged when we are not using it. All year round. So I'm thinking heat...
 
Has anyone ever had problems like this since Bennington switched to the Semtex seating fabric? Curious if that has made a positive difference for those that have had seat rash due to cover siting against top of setbacks in sustained extreme heat.
 
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