Yes, every time I unsubscribe from a thread, it remains in my profile's activity feed and I continue to receive notifications of new posts.
Repro Steps: What steps did you take to reproduce this problem?
At first I thought it was just a browser caching issue because I had not refreshed, so I refreshed and the thread I had unsubscribed from remained in my profile's activity feed.
Expected: What action did you expect to occur when this bug appeared?
I expected to be unsubscribed from the thread so it would stop appearing in my activity feed when there are new posts, aka disappear entirely from my activity feed.
Notes: Any additional information that will help us diagnose the issue
When going to My Profile, I'll go to unsubscribe from a thread by clicking the red "X". After clicking the red "X", nothing happens, I am not unsubscribed from the thread. Refreshing My Profile does not fix this.
As far as how I have subscriptions setup, here's a screenshot to help you:
Browser, active browser addons, and operating system
Firefox 10.0.2, Noscript (allows everything but quantserve and scorecardresearch), Windows 7 Ultimate 64bit SP1
URL where the issue occurs
It occurs in My Profile.