I created my first presenter notebook for testing purposes and then both saved it and exported it as cdf. When I re-open the nb file, the Presenter menu on top is not functional, whereas this works without problems with the cdf.
To re-open the nb file correctly, i.e. with a working menu, I have to take the following workaround:
1. Open Mathematica (I am using 12.0)
2. File New Notebook
3. File New Presenter Notebook
4. Open file (to re-open my nb presenter file)
Now my presenter notebook will be opened correctly. I have attached two screenshots: the incorrect opened presenter file and the correct opened after my 4 steps of the workaround.
There is no error message by Mathematica.