musescore new sound plugs cannot playback some of the notes written on score

After a long struggle of getting all the new sound packs, now I have found a new issue which bothers me a lot when playing back on the works I have written - some of the notes (all instruments) are not being played.

Like for example - violins dont produce sound after 3rd octave and some wind instruments dont play higher notes too. Is this normal ? Do I wait for the programm to fully settle down after download ?

The audio playback, while terrible, in previous 3rd version was much more satisfying - its like the higher registers in some instruments does not exist.