I just got a 5540 from amazon and show/nav doesn't work on any show(works fine on the other RTV's), I haven't let it do a software upgrade yet since I was hoping to get ca/ivs from it, but maybe a software upgrade will fix it. I have it setup to do ca and ivs now, but ca's not working and IVS doesn't seem to be(ivs tester works, but no one can send me a show).