cannot zoom in photo after update to 2.6.10

[cs071372]

Hi all,
i recently updated to VirtueMart 2.6.10. Before the update, i could just bring the mouse cursor over a product and i could see a zoomed photo of it. But after the update this function disappeared, and i cannot find anywhere in the configuration panel something related to 'zoom product'. Any ideas about that issue?

thanks in advance.