Nuendo 10.2.1 Time Base Toggle Issue

Hi all,
I’ve recently made the jump from Cubase to Nuendo.

I’m having an issue whereby Nuendo isn’t letting me toggle the timebase of a track (eg, instrument track) between musical and linear.
Is there some setting somewhere that might be locking this, or is this perhaps a bug?

This is driving me nuts - any help is certainly apprecaited.


Why Nuendo isn’t letting you to do this, please? Can you see the button? What happens once you press it? MIDI/Audio track?