hi! i'm a newbie. hope i'm welcome here. former windows user. now a proud owner of mbp retina 13. very nice display. but recently i noticed that whenever i open my yahoo mail in chrome and if i scroll up and down there is this blue horizontal lines appearing on the screen. i will attach the screenshot so you will know what i mean. anyway i noticed that the line doesn't show on other websites only in yahoomail and even when i'm browsing on safari webkit with same yahoo mail opened. plus if i zoom-in/out(+/-1) the page, the lines disappear and doesn't show up anymore. i think it only shows on certain zoom percentage at least for now. i still have time to return this and exchange for a new one. i'm just worried what is causing this, that it may get worse. but if this is just a bug or minor issue i think i can deal with it. anyone here experienced the same issue as mine? thanks in advance.