Hi there, to make sure I understand you 100%, would you mind taking a screenshot of one or two of the posts where you still see a gap i, so I can be sure what the issue is?
Here's a guide on how to make a screenshot, if you're not sure: http://en.support.wordpress.com/make-a-screenshot/
You can upload the screenshot - in a graphic format like JPG, PNG, or PDF - in your Media Library so I can see it.
Regarding the other two issues:
Whether one clicks the left or the right arrow it has the same effect: it always goes to next post.
I've reported this bug to our developers and will keep you posted here, as I mentioned earlier.
About the last issue, what I meant is that, one may click the arrows and go to another featured post (as many times as one wants), but after that, the post slider stops moving on its own (automatically) as it should.
I'm still not quite clear on whether this is a bug, and how it differs from the expected behaviour. If it is a bug, it might be related to the first issue above. How about we wait until that one's fixed, and see whether that resolves issue #2 as well? Does that sound good?