Normal sample pack is not visible

[mlib]

I am going to assume that the path to your sample libraries has been added to Media Bay.

The only thing I can think of is that the Media Bay database has been compromised.
Try following the suggestions from @Romantique_Tp in this thread:

Missing Loops & Samples

The solution is similar to these instructions: FLUX Wavetable Synth missing in HALion Sonic SE 3 I’ve edited them for Cubase users: Windows Close all programs. Open the “Run” command prompt by pressing the Windows logo key + R simultaneously. In the command line of the ‘Run’ window, enter one of the following path shortcuts:: user specific installation (standard): %appdata% installation “for all users”: %programdata% Simply use %appdata% if you are in doubt. A new Windows Explorer Wind…