Hi,
these texts in the default tour skin are realized via the showtext() action, which isn't supported in the HTML5 viewer.
See here:
http://krpano.com/docu/html5/#supportedfunctionality
A new and update tour skin with where these texts will be supported in HTML5 too will come with the 1.17 version.
In your tour.html there is probably html5=prefer set, change it to html5=auto to prefer Flash on desktops system. In the tour_editor.html there is html5=never set, because the vtoureditor plugin is flash-only.
Please see also here fore informations about the html5 embedding setting:
http://krpano.com/docu/html/#html5
Regarding 'panning is much smoother' - that means your gpu-hardware is probably not good enough for hardware-accelerated html5 rendering so that the Flash software-rendering is faster in this case.
The problem here is, it's not possible to detect what rendering method - html5+webgl, html5+css3d or flash would be the fastest one on the current system...
What browser were you using?
And what system and gpu-hardware?
Best regards,
Klaus