Tags are just words, not multiple words, this is how youtube parse tags.
We will be releasing a patch for this shortly.
There is no change in SEO side, only change done is returning 404 page when there is no page, before 2.8, it did not return 404 error for non existant pages.
Locations of advertisement depends on template used. If you have suggestion on new ads location, let us know we will try to add if it is useful to everyone.
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