An empty guide
Providers differ in how much schedule information they publish, and some publish none for certain channels. Pull down to refresh on the channel list first. If a channel still shows nothing where others are full, your provider has no schedule for it.
A group with nothing in it
The app lists every group your provider reports, and fetches a group's contents when you open it. So a group that looks empty at first glance usually fills in a moment later.
If it is still empty after that, your subscription genuinely does not include those channels. Ask your provider to add the package.
A group with a padlock
That is the parental lock, which is always on. If nobody has set a PIN on this device, the code is 0000 unless your provider has put a different one on your line. The parental PIN and adult content explains all three codes and how to set your own.
