I'd be surprised if this hasn't come up before, but I can't search well:
The trill samples in Solo KS instruments in GPO5 don't actually trill...! Well, they go up one note when you release the note.
The Section KS string all play trills correctly, trilling the notes while the key is down/note is playing.
I'm hoping this is a mistake that can be rectified with a bit of editing of some of the text files. Can it?
I'm on MacOS, if that's relevant.