CS5.5 opens blank workspace and timeline for some of my files
I worked last year on a project in CS5.5, saved my files and did not open them until now, when I realize things are not loading properly. The timeline is blank with no layers and frames, same as the workspace, but all my objects are in the library.
I did not made any changes to my PC, to my Flash installation, to these files. Other files are working fine, only these ones have problems, even tried opening them on another PC.
So what could be the reason?