Works normally for me and as the hotspot is an image, renderer=webgl is already the default behavior...
the 'home' button of the example: https://krpano.com/releases/1.21/…tml5=only+webgl is not clickable?
Okay, 'not clickable' by mouse - now I see the problem:
The 'vr_menu_bg' hotspot is a textfield and is rendered as HTML+CSS3D element by default - and these are above the WebGL content (the other hotspots) - and therefore blocking them from receiving mouse events.
But for fixing that, renderer="webgl" would need to be added either to the 'vr_menu_bg' hotspot or to the 'vr_menu_style' style, when adding to 'vr_menu_home' nothing will change. 
The example will be fixed in the next release.
Thanks!
Best regards,
Klaus
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