This is your resource to discuss support topics with your peers, and learn from each other.
You should probably code up the simplest test case possible and open a ticket in the issue tracker.
I'm doing this on OS5.0 and I'm getting a completely OK forward message. I don't have a 6.0 device to test on.
Yes, it's free, but you have to have a developer ID.
There is a post someplace that gives you a link to the system.