Thanks for the input guys, but unfortunately it doesn't seem to help much.
With adblock on, "VG card" images didn't show up at all, with it off now they show up to 230.
With adblock on, I could always see "VG png" but they only go up to 230. Turning adblock off doesn't seem to have affected "VG png" at all, it still only goes to 230.
The above is with Firefox. I also tried IE and Chrome, neither of which have adblock installed, and got the same results as firefox with adblock disabled. Puzzling.