I go to here http://forum.unity3d.com/subscription.php?folderid=0 and I see all the threads I get emailed about, but I can’t seem to select any in order to unsubscribe to specific threads. Any ideas?
I was trying to do this the other day, and came to the conclusion… it’s broke! Probably just an oversight from the last board upgrade, but it would be nice if someone could get this working.
Yeah I hope it gets fixed…
This matter is being investigated.
You can manually unsubscribe from a thread within the actual thread view itself if that helps at all, just appears to be a template issue within the user CP. 
Also found the emails themselves have a link that lets you unsubscribe to individual threads
Ah, nicely spotted. Thanks for the tip!
I can’t find it. Where is it?
I know this thread is ancient-- but was having a similar problem. After much hunting, discovered that on the page of the thread, on the top right corner of the very first post in the thread ais a link called ‘thread tools.’ you can unsubscribe from a thread by clicking that.
still no way to ‘select’ threads to unsubscribe from in my user preferences as far as i could tell…
Yeah as I mention above, I find it easiest to just use the unsubscribe link at the bottom of the emails they send out
I would also like to notice that several editing optiions are broken in firefox ( quotes, marking pieces of text as code, sometimes images insertion, video insertion ) but work in Chrome.