I have tried to search this all over the net and I seem to be the only one having the problem with this, which is really strange.
When I am trying to assign a new sound say for a new AIM message or any other application message and I am trying to preview the sound it will not play.
These are the sounds that were originally installed on the phone, and did play at one time when I previewed them, but for some strange reason they have decided to not play.
I haven't downloaded or added anything new to the phone, it's pretty much stock.