SEX8 doesn't have autofocus. Barcodes are scanned from low distance (to fill the whole screen) and your phone probably can't focus on it. This is not failure of program, but of phone (many phones are produced without aufofocus and camera is focused to some distance, which is ok for landscape photos, but not for near photos). On phone with autofocus, camera always focuses from blurry to sharp image and after while see the code without problems.