Black screen instead of Pano in Yandex Browser on some systems.

Hi guys!

I had reports that on some systems people see black screen or black areas instead of pano in Yandex browser. I took my old Win10 laptop, and yes, even
Krpano example Corfu tour has this problem... However, all is OK if I open Corfu tour in Google Chrome on this very same laptop.

The latest Krpano version is used, of course.

What could be the reason?
Thanks!

Small update:

I inspected Console in Yandex Browser and found these errors:

WebGL: INVALID_VALUE: texImage2D: packImage error

[.WebGL-000041F200B10D00] GL_INVALID_OPERATION: Texture format does not support mipmap generation.

On my PC, Krpano Corfu Tour viewed in Yandex browser works OK. Strange... seems that this problem is somehow related to some systems (GPU + browser?)