Hi all, i was bothered from that red border appearing from time to time around my 7" display. I thought it was a problem with the custom Android version for UDOO but playing with the Android Studio, it happened on a virtual device too. So i googled a bit and i think i found a solution. This is caused by the "strict mode" feature. The red border means "high activity" and it's there for developers to diagnose their apps. I tried to disable it from the developer settings. It was already disabled so i enabled/disabled it but it didn't work. So the alternative way was to modify the file build.prop. At the beginning, i followed those instructions and my Android didn't boot anymore. I had to reimage my SD card. So then, i found a free app called "BuildProp Editor" and i added these lines: persist.sys.strictmode.visual=0 persist.sys.strictmode.disable=1 After a reboot, i tried with, for example, ES File Explorer, which always gave me the red border, and isn't there anymore! If you wanna try, please make a backup of your SD card BEFORE so if you mess things up you can go back
