Hi Keebo,
Funny you should mention this... As I was experimenting adding AJs surface to Sonar I did have a hickup with something like this. Again I am only using XP Pro 32 bit. I though I had everything working and was playing around with the surfaces and then had a problem where the BCR was not working and then saw that the bcr2000control was not assigned. So, I tried to reassign it and when I clicked OK, the dialog refreshed, but the bcr2000control was still blank (even though I assigned to the BCR2000 ports).
I tried a few more times and bit the bullet and went radical and reimaged my machine with an image I took just before I started playing around. Then reinstall AJs surface and everything was working again. That was over the weekend, so I am not sure if it was a glitch, or a button combination I hit, or something else. I'm going to keep playing around to see it it shows up again (I am working a project and backing things up as I go) hopefully it was just a glitch.
If that sounds like your problem, you might want to try to reimage - not a great solution, and a bit tedious, but it got me back alot quicker than trying to troubleshoot (about 20 minutes start to finish).
g