I have experienced the same as described by correctioncx. I have noticed that only after I check in, my seat shows as occupied (solid blue). Before check in, when only reserved, it showed with an X as blocked, but not occupied. Before, these blocked seats could be reserved by calling Marco Polo and having status. Now, some of the seats that appear blocked are in fact occupied , while others are not.

It surely does not behave like it used to. I did emaile expertflyer and they responded all is fine (which is not).