I am running Screenly OSE and it was working fine until I recently started adding new assets. It showed my existing 2 assets but would not add any newer assets into the rotation. I deleted the two existing files hoping that would refresh but now screen only shows the faint grey Screenly logo no matter how many new assets I make active. Both the old and new files are .PNG images files of similar size. Any ideas why my active assets are not showing up?