I'm getting the error message "This file could not be saved."  I close S12 and reopen and do a file/save - same message.  I can edit and play with the project, but can't save it.

 How do I get the project back to a savable state?

Try opening studio with administrator privileges. Right click on 'studio', click on 'run as' and select a log on that has admin privileges.

Don

Opening as administrator didn't work.  I also tried rebooting just in case something got corrupted in the program.  Stilll no joy.

 What did work is cutting and pasting the entire project into a new project and renaming it.  So far that seems to work.  Everything seems to be working fine in the new project.  The old project still can't be saved.