Since installing PianoTeq 3.5.2, in the tuning section, under 'Diapason' 440 Hz reads now reads '420 (443.59)' or another figure in brackets, instead of 440 Hz, on all the preset piano created profiles that I've made. In the 'Temperament' section, it now reads 'equal (*)' instead of 'equal'. All the original factory piano profiles reads ok.

Why is this?

You likely have notes detuned in note edit mode.

You can check using the "A" shortcut key, the Window->Note Edit menu option or by using the "Detune Notes" at the bottom of the Diapason drop down menu.

Why is this?