I asked several engineers about this box, These are some "tries"
Make sure your DTV onscreen program guide is on and then reacquire channels. We are not currently feeding any program information but some stations have seen this keep the receiver from locking.
Manually tune in the 11-1 frequency. this is 193.25 Mhz. I have not had hands on experience with this box, but I believe you can manually enter the frequency. You might also try 193.260 Mhz since our channel 10 is +10Khz offset.