Firstly Youtube is NOT blocking SeoClerks links or affiliate links because the first thing I did when I saw that discussion is check my Youtube video where I promote SeoClerks with my affiliate link and everything is fine.
However today I wanted to reply to a comment someone left on one of my Youtube videos and include an affiliate link to Clixsense and it was being blocked!
I checked my Clixsense video with my affiliate link and all was fine.
This leads me to believe that Youtube is now blocking all affiliate links in Youtube comments but not in your own video descriptions.
This is actually quite nice in my opinion because I am so tired of having to delete comments on my videos when people leave their own affiliate links! It will clean up a lot of the spam on Youtube thats for sure!
It will mean that if I create a video promoting something that my hard work doesn't get leaked out to other people just throwing their links on my videos.
There is a way around this little change. Create your own videos and your own blog posts and you can leave those links in comments. It appears that Youtube is only blocking affiliate links in comments, but not all links.