Adobe Reader save button greyd out

Hi guys,
Do you all have the save icon/button on the top toolbar of Adobe Reader greyd out?
The "Save as" option from the menu works fine.

I'm a bit surprised for not found many reports on my search.
I would appreciate if any of you have some explanation.

Thanks

Yes, it does seem to be greyed out on mine as well. It looks like it may be tied to the Save option as if I open a fillable PDF and make changes, it becomes enabled.

You're right, I can confirm that, thank you John for the input