Problem with some keys in Cubase (keys open windows and doesn't play sounds)

Hi. I have a problem with Cubase Pro 13. I work with the Vienna Symphonic Library using Arturia KL Essential 61 as a midi controller. Irecorded some tracks of a project, and it runs well, but if A try to record the cellos track (and all the other instruments that play in the same register), some keys of the KL open some windows, as the mixer or the window to add trakcs, also in that area of the keyboard some keys do no play sounds. What can I do to solve it?
Many thanks.

Hi,

It could be that the octave you’re playing at is out of the VST’s range. It may be worth reaching out to Vienna Symphonic Library for further clarification.

No no, it’s perfectely in the range. One of these keys is the C2. But, f.e., the C1 runs well.

Do you have the latest firmware and the DAW integration script installed?

https://www.arturia.com/products/hybrid-synths/keylab-essential-mk3/resources

Yes.
The only thing that comes to mind is that in the VSL Synchron Player the middle C is not set as C3 but as C4. But it seems strange to me because I had changed that setting a long time ago. I will check this evening. However, I can say that even transposing an octave with the Arturia transpose the problem still occurs, transposed by an octave.

Perhaps try a factory reset of the controller, just in case any strange settings are causing this to happen.