Version 7.2.1
There are a variety of action buttons throughout the site that run code without reloading the page such as Ban, Fave, Feature, Activate, Befriend, Block, Subscribe, etc. Subscribe triggers an alert message to say it's been done. However, the rest just show an in-page success message that is below the fold and closes by itself.
This is really not intuitive. Users expect the button to change. When it doesn't change, they assume it didn't work. They keep clicking and wonder why it's not working.
The forum topic subscribe link is the same.
The Fave button also doesn't update the count shown on the page.