No way for me to be absolutely certain, but it sounds like you are still in a mode that needs a confirmation before it is finished.
For EXAMPLE (only) if you were in Crop tool mode and made adjustments, you must accept the changes before you can save, etc.
Look along the toolbar for Accept and Cancel buttons and complete your action or cancel it.
If this is what is causing the problem, you can then save it.
Hope this helps.
Steve Crook, Jr.
http://www.stevecrookjr.me
I am a simple creative professional that can get my Adobe suite and a few other creative tools to do what I want. Barely. 🙂