After working for some time on some flash content, the .fla appears to have been corrupted. Symbol contents appear to have been deleted, resulting in empty symbols on the stage, represented by white dots.
We have experienced this before when working between Flash CC and CS6, but now all designers/developers are working in CC. The file was originally created in an earlier version of Flash though.
Obviously we cannot go back and start from scratch in CC, does anyone know how we can stop this from happening? Can provide a broken version and a much earlier working version of the assets.