I'm annoyed by the fact that I see replies to fully muted posts that have a link in the header to the muted post that if I click on I will never see.  But this isn't as easy to fix as I had hoped as we have to check every post's parent to see if it is muted which is not a cheap operation currently. 

 Actually it wasn't too hard. Fixed on unstable for the muted case. 

 hmm, that's not my issue, I don't have many people muted.