This issue has been a bane on my 1520 since the beginning. Just something you have to live with until they feel it is worthy of fixing. After this build when I got yet another row of icons, the picture is only on half the screen now. Yuck!
Yup, same here. So many scaling issues. Tiny tiles, blurry tiles, partial background, disproportionately tiny icons on some of the small tiles. It's kind of a mess..
Yeah, I finally tried the windows 10 preview on my 1520. Got the same problem and it was just too unbearable to stay on the preview. It was just killing my eyes with the tiny and blurry text. I was looking forward to really digging in on 10 too. I rolled back already and will wait until not such an annoying bug is present. The start screen is too frequently used to deal with the bug.