Unlikely, have you checked that the new view is marked as visible, is not behind another view or pane, is not the background colour with no text or anything that you can see, is not outside of the screen area (either by positioning or Designer script error). That's about all I can think of without knowing more about the layout.
Thank you very much to both.
It is an application that is running on thousands of clients.
The activity that has the problem contains approximately 200 views.
I have been asked for a new functionality and by adding a simple "label", it is not displayed.
I've been there for days. I will continue to check and comment.
It is also an application made in older versions of B4A and now I have opened it with version 7.30 (I do not know if there may be a problem for that)
Thank you.
I already found the problem.
The problem is android 5.x
So far all my users had android 4.x
I found this link warning of the problem and the solution: link1 and link2
I hate android
Thank you very much to everyone for your help