If you import a new band set in the pipe network profile view, Autodesk® Civil 3D® resets the Data Source (under profile view properties). As a result, the labels are not displayed in the profile view bands:

To fix this problem, you need to set the Data Source for each and every pipe network band in each and every profile view which can take a few hours for large pipe networks:

Fortunately, iDAS has a command to set the Data Source for multiple profile views simultaneously. Use the iDAS - Profiles - Set Datasource command:

Select the pipe network and profile views you want to modify (there is also an option to add or remove profile views from the selection):

Result:

The selected network is automatically assigned to all the Pipe Data band type in the profile view properties:

NOTE:
If the suggestion above does not help, try the following:
1. Make sure that the layer with the profile view band labels is not frozen or switched off :

2. Check if the labels are not turned off in the profile view band styles:

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