It's an Italian thing.

Must be something system specific your end, they show up and seem to work fine here, don't use them that much but just gave them a quick whirl and everything seems fine. I only have
 
HoRNet HTS9     
HoRNet SW34EQ     
HoRNet Harmonics     
HoRNet VU Meter MK3     
HoRNet AnalogStage     
HoRNet HDS1     
HoRNet HDD1     
HoRNet Chorus60     
HoRNet DeeLay     
HoRNet VU Meter

mettelus
Putting the arranger track in the free version stands out as a nice marketing move. That is a slick feature that would make users critical of other DAWs.

That seems like a very good strategical move on their part .
 

BobF
Very smart move, IMO.  The arranger track is very useful

+1 ....how does one access this feature in Prime ? 
 
Kenny

Kenny, check the vid:
Presonus Studio One Prime arranger track
 

KingsMix
Kenny, check the vid:
Presonus Studio One Prime arranger track
 

Hi KingsMix ! thank you for posting that video
 
Yesterday I bumped up my Prime to the newest . When it came to figuring out the arranger pane I was clueless .
 
all the best,
 
Kenny