Bearing in mind that I stayed in an identical apartment (6a of block 6), to the McCann apartment (5A of block 5) when I visited the Ocean club in June 2010 - if the shutter at the bedroom window was already raised at the time Kate McCann alleges she did the 10pm check then as soon as she slid open the patio door on the poolside of the premises, the bedroom door which had been left ajar would have banged closed because of the vacuum between the open bedroom window and the open patio door..
I know this to be true because I carried out such experiments myself using the patio door on the poolside of apartment 6A (block 6), the corresponding bedroom door, and the front door situated on the roadside of apartment 6A - basically put, I set the roadside door closed / open, and then went into the equivalent bedroom where the McCann children slept leaving that bedroom door ajar I then went to the window of that bedroom, and making sure that the curtains to the window were in the open position, and that the window itself was slid fully open, and that the window shutter was raised. At this stage the patio door had remained closed. There was no Whooosing of the bedroom curtains, or the slamming of any bedroom door..
However..
Upon me going to the patio door with a view of opening it, and as soon as I did both the front door (when it had been left ajar) on the roadside of apartment 6A, and the bedroom door which I had left open both suddenly banged closed together. I carried this test out several times, and with the same result relying on the same circumstances. what I mean by that is that depending upon whether I had left the roadside door either closed or alternatively open, and then went to open the patio door I got a different result. Since from the starting point of keeping the road side door closed and then going through the same process I found that leaving the roadside door open and not opening the sliding patio door on the poolside of apartment 6A block 6) did not make the corresponding bedroom door slam shut. On the other hand with the roadside door closed off and the opening of the patio door on the poolside of the apartment, and that did cause the bedroom door to slam shut.
What this tells me, is that whichever way Kate McCann describes the banging of the bedroom door occurring or having occurred, and the Whooosing sound of the curtains at the bedroom window of apartment 5A (block 5) and her then discovering that the glass window had been slid open, and the shutter on the outside of that window fully raised, then she could not have entered apartment 5A as she claims without the bedroom door slamming closed.