It seems that you are having some issues if you connect the Slingbox PRO using a gaming adapter.
Most of the times, this issue is related to the connections on the back of the wireless bridge. Make sure to verify that all the cables are properly connected into the right wireless adapter inputs.
Thanks, Ranaleon, but that's not the problem. My Slingbox Pro has been working perfectly for a couple of years. Only recently I could no longer connect. None of the connections have changed, but I checked them anyway.
I'm beginning to think that the Slingbox is dead, but I don't think it's fair that I should have to pay for support. Maybe I'll replace it with a Vulkano -- my brother has one and I think it's better.