i've been using the markers app on my nexus 7, 32gb. recently i noticed a faint vertical line appearing while i'm drawing. i've narrowed it down to one particular brush on the transparent setting. i'm hoping its an app problem and not a dead or dying pixel as i've only had my tablet a couple months. but it only appears in the same spot. when i save my drawing or take a screen shot you can still see it so i'm thinking it's more of an app problem. i've already uninstalled & reinstalled the app. any other ideas how to fix it? here's a screen shot, i hope you can see it. i've indicated w/pink arrows where it is.