Hi, you quite right, I am no longer doing anymore developement on SWP but the best you can do is go look at the posts on our forum and see if you can find what's causing your problem.
http://www.jonof.id.au/forum/index.php?board=13.0
I do seem to remember Vista and 64 bit was a problem and whether we ever solved it I cannot remember.
It works fine of Windows7 so its quite possible that we just gave up on Vista as it also gave us several sound problems.