I'm getting yellow blotches all over the page. This is the second time this has happened. All was fine until I took the yellow out to test another one. I upturned it to get the chip and when I put it back in I'm now getting blotches all over the page. As it's yellow I can't scan it in to show you. Cleaned the dev roller, blade and vacuumed the adder roller and made it worse, though it may have worsened whether or not I touched it. Has it happened to anyone else?

Kevin