Working out that my multimeter isn't good enough to measure 10pF and resigning myself to swapping out a dozen various 0603 capacitors to work out which ones have been specced wrong.
I guess that's a simpler task than the swapping out a couple of hundred 0603 capacitors that I'm expecting will be the next step once I track down the bug.
Though there's a chance that'll be the fab house's problem rather than mine