In firefox, if you have fire-bug plug-in, you can see details of each AJAX call. Do you see any errors there? See what request you are sending and see the response.
Can you simulate the issue @ apex.oracle.com?
I can't seem to find a difference between the elements when the update actually happens and when it doesn't.
The only thing is that in the first case there is a 6ms receive period, and in the second there is no response.
There are no other differences...and I don't really know where to look for an error or a warining notification...
I noticed that when I press the filter button and then update, it works. But when I try update after I already clicked it, nothing happens.
I don't know, it's like it doesn't notice that I have changed the update field values...