I'm not using krpano skin files, but custom pngs that I have created. In general they are twice bigger in pixel size to the actual size I put in panotour pro for them. For example, many of my icons are 100px x100 px, but I put 50px x 50px in the panotour parameters, so you can see them in high resolution on retina screens. But with 1.21 it's like having these icons with a size of 25x25 in mobile devices. I don't know how to code, but reading the release document of 1.21 I see that there are changes in some paramaters like "scalechildren" and "scalesize". I'm not sure if that could be the issue but I cannot find that paramaters in any of the xmls generated by Panotour Pro anyway.