While the file is not read only, I've discovered that, for some reason, sometimes the view state of the project explorer windows *still* doesn't get saved/restored properly - especially (or so it would seem) when more than one project explorer window is in use. Instead, it seems to get stuck at some point and will no longer be updated with the current view settings. Deleting the content as suggested, however, is a functional stopgap for this, allowing a new view state to be written to the file. But ultimately, Audiokinetic should revisit the code for saving/restoring the project explorer view settings to resolve this erroneous behavior.