Double-click: It seems that recently the double-click is not required in some cases. This seems to be after you reply. However, if you enter a discussion and do not reply, then backing back to the discussion list seems to take 2 clicks.
Other: I was trying to find the previous post on this topic in the forum comments and failed to find it. Maybe it is me. I was looking at my own posts, but could not figure out how to sort them by forum or topics.
Here is the past link the to double click problem. http://forums.adobe.com/thread/988260?tstart=0
Note that this double click problem is not restricted to Adobe forums. If you do a web search it is all too common.