Hi Rolf,
I took a quick look at this issue you pointed out for the February Release, I agree with you completely, there seems to be an issue. I created a quick test screen to add the SessionIP to a field on my screen, in Feb. Release, I get the same IP address you mentioned (obviously not my IP). I then loaded this screen in the Oct. Release, this time I did get the correct IP, just as you suggested.
I will have to put a ticket in with our Development to take a look at this and get it fixed. As soon as I have any feedback regarding this, I will post here.
-Ben