This is a known issue that will be fixed in coming iterations.
If the BP was previously connected to adifferent base, with a different set of channel names, the BP says "Loading...". while it tries to resolve the old channels names stored in its local memory to the new channel names that the basestation its now connected to is using
To fix this, simply program onto the BP keys.. channels which are available from the basestation the BP is currently connected to  and it will work fine... or re-link to the other base that the BP may have been attached to previously throughlinking.or reset the BP to default and it will load the first 2 channels from the basestation it is currently connected to