I was having the same problems with Sirius IR not working. I am running firmware version 1.37. This is what I did to get it working again.
1. Pressed the Stand By / Main Zone Mode Button
2. While holding STRAIGHT on the front panel, Press Main Zone button.
3. Pressed PROGRAM Button to select an item.
4. Look for Sirius Lock, Press STRAIGHT to unlock
5. Pressed the Stand By / Main Zone Mode Button to lock in the new Settings
6. Select "On Screen" Button on remote, Scrolled to INPUT, Window on TV Screen pops up, selected SiriusXM Internet Radio Icon and selected the up arrow, above the select button (on the remote).
7. Deleted the account and re signed in with correct user id and password.
Hope this helps everyone.