I finally got both my wireless receivers converted last night.
It helps to have the switch ports properly configured for the correct VLAN. I use the same switch to support my STBs on the "outside" segment that I have all of my internal devices plugged into. So, VLAN assignment is a wee bit important. I do not cary multicast through my router. No value in that.
What I discovered was that at some point the STBs did something to error out the particular switch ports and they had gotten suspended. I had to manually reset them and then bounce the STBs a second time before they were off to the races. Now I have a happy wife.
Now I have to run 2 additional CAT5 jacks at the same locations so that we can watch Netflix on those TVs. I have no interest in buying more switches. Good thing I have attic access right above the drop locations and plenty of spools of spare CAT5e and jack inserts. Need to do it today while it is cool outside.