Hrmmmm - Well, I tried the above solution, but it didn't fix my problem. I have a Static Page set for my home page, the Subscribe button in my sidebar (on every page of my site), and I have the Share button at the bottom of my posts.
I already HAD the Display Share/Save button at the bottom of posts on the front page unchecked, so I had to also uncheck the Display Share/Save button at the bottom of pages option.
The buttons now each work as expected across all pages of the site EXCEPT on the Single Post pages, (which are also the only pages on the site that display both at the same time), upon which the Subscribe button gets overwritten again by the settings in the Share button (they each display the same thing - the Share options).
So basically, you can't use both at once on the same page.....?????