scook
If you do not like the dark PRV, copy the TungstenTheme.fth from the SONAR 2017.10 program folder into C:\Cakewalk Content\Cakewalk Themes changing the file extension to .sth. You may also change the name of the file if you wish. Then load the theme in Cakewalk Preferences.
Also check the VST paths in Preferences along with the rest of preferences. This ls a new product and you have to set it up like one.
On my install, it had the Tunsten theme already installed, but it wasn't the default. So check, it might already be there...
-d