i still find an/the issue on the preview image on larger panos.
I dropped a 66222 x 33111 pano on MAKE VTOUR (VR-OPT) Droplet
Thanks for reporting, yes there is a bug and you're right about the preview type.
When the pano width is larger than the converttocubemaxwidth setting from the config file (which is 60000 by default), then the sphere-to-cube conversion is skipped and the pano will be processed as spherical pano.
And the bug is that the preview image will be still build as cube-strip pano - and as seen without telling the xml that the preview pano is a cubestrip. Without explicit type setting, the viewer assumes the preview pano has the same time as the main pano image.
The problem could be fixed by adding the preview type in the xml, but the more correct solution should be to build the preview pano image also as spherical image in this case.
This will be fixed in the next release (1.20.7).