Painttoad is faster than I am..Like he says, your DVD player is configurable in the way that the signal is passed to your pre/pro, so try that first. I had the same issue in my first foray with Digital surround sound.
This, of course, assumes that the not locking on part is in the fact that the menu on the 950 doesn't allow the selection of surround sound, instead of Surround sound is selected for the input but not coming out of the speakers. If the latter happens to be the case, note that you can configure all but the main speakers to "none" in the 950 menu, which could cause that problem.
If those two don't work, I hope something else does. Hate to think that someone with enough taste to buy outlaw would sell a bad unit!