Navigator panel doesn't show all pages

Hi, gang!!!

I use MuseScore 2.0.3 into Ubuntu Studio 16.04 LTS.

Since a while I have discovered that the MuseScore Navigator panel has a very rare behaviour, sometimes:

It doesn't show all music score pages when the loading process ends.

It is going to show the pages when they are played, or when we click on them, manually.

I think it isn't a normal behaviour.

How could I fix it? ???

Greetings & Blessings from Chile!!!!!!!

Juan