Problem with Cubase Pro 8.5.20


I have a problem with my Cubase Pro 8.5.20 :

1 - The Media bay does not contain the “rescan” fonction and I cannot add a new disc scanner.

2 - The sound is distorded and false when I extract all the tracks (around 20 tracks) to a wave file.

I had some RAM to my PC but nothing has changed.

I used Cubase artist 7.5 and I had not those problems.

Do you have the same problems and do you know how to correct them ?

I thank you a lot.

Best Regards,