I'm having the same issue.  I've used the various methods listed here, and all the time I get 0 comments, even after creating comments manually. 
At the moment I have 
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{CGFeedback key1="CGBlog" key2=$entry->id action='ratings' ratingstemplate="CommentNum"}
But have also edited the default ratings template and still get the same.  I've not altered any major settings so assume key1 CGBlog is still correct (using CGBlog and CGFeedback).
I know it sounds silly, but is there anywhere specific in the blog summary template it should go?  I assume it goes between the {foreach} so it counts the comments just for that one entry then repeats on the next?
Any help would be greatly appreciated.
**As an update I noticed that even without editing anything and just using the {cgfeedback action=ratings} with default templates i still get 0 comments.  i've checked in cgfeedback and it shows the comments, with key1 as CGBlog and key2 as a number.  The one thing I did notice however was that it would have an ID of, say, 5 yet key2 for it would be 6.  Should these be the same or has something gone a bit wrong somewhere?