Can't save - no error message

It’s been a while since I used Scrivener, so this may be my error. I made a copy of a private template created by a client, and then proceeded to use the binder as a project. However, the project won’t save, as evidenced by the fact that the timestamp on the file doesn’t update. I’m afraid to close the file, have tried everything I can think of including saving it as a template to open again. No dice.

Help! I need to discuss this with my client in just a few minutes, and he can’t see my work!