You did not list your receiver, but since you picked up Sat 121 at your old place, it can pick up FSS transponders. Therefore, it shouldn't matter which DPP-44 Port each of the LNBF and/or Satellite signals are connected too (unless you have other legacy receivers). Normally 119, 110, 121; but any order should work. Port 1 is normally a pass through when first setting it up, but I would use a barrel connector and by-pass the switch to set up when having problems.
The error message you received is normal when it doesn't know where to find the satellite you selected in the point dish screen. However, I believe the DPP-44 should show that there is 3 LNBF's connected, even if it does not list a satellite. I think it would show "Feed" if it detected the FSS LNBF without a signal.
Additional Possibilities:
The DPP-44 (and DP34) require longer than normal center conductors.
Look at the 3 cables going into the DPP-44 switch, is the center conductor the same length on all three? If the one from the FSS LNBF is shorter, then replace the connector to make it longer, or first, try swapping the 110 cable with the 121 cable at the LNBF, then run a check switch to see if it now detects the FSS LNBF.
As "Dave nye" said, you have the dish pointed incorrectly. I believe this to be the issue at your previous place and current place. With the SuperDish 121, there is a very fine range of movement, both azimuth and elevation, for you to pick up all three satellites. It is real easy to pick up either 110 and 119, or 119 and 121. Then you need to swing it very very slightly, and/or adjust the elevation very slightly. Of course, you need to get the receiver to recognize all LNBF's.
(NOTE: On one SuperDish I installed, I had a mark on the mast, and if I swung it more than 1/8" on the mast, I lost the signals.)
Once you have your mast plumb (all sides) and the skew set. I recommend you attempt to get Satellite 110 and peak it. If you can not get the receiver to detect the DPP-44 with 3 LNBF's, then I recommend you by-pass the switch (use a barrel connector) and connect the 110 directly to the receiver to peak. Then connect the 121 LNBF directly to the receiver and look for its signal. Peak 121, and then re-check 110. (Note: By-passing the Switch using a barrel connector will also temporarily eliminate any issue with a short cable.)
Possibly the top half of the window (top glass, and bottom glass when raised) is blocking the signal from coming in, hitting the dish, and reflecting back to the LNBF. Maybe lowering the dish would help. But since you are a good distance north, maybe those trees in the distance could be the issue.