If you run the Xoticar tour on an Android smartphone (ver 4+), run in desktop mode, it will run fine (except the splash screen is not displayed and the arrow hotspots will disappear if you zoom too much, more bugs).
Then disable desktop mode and refresh the page, the splash screen works, the arrow hotspots don't disappear, but you get a square thumbnail type image overlaying the panorama in the top left of the screen. As you move the panorama around, the thumbnail tears apart and disappears, then reappears on rotation.
When I reported this a few weeks ago, you thought it might be low memory on the Android phone. I don't believe that's the cause, as it works without glitches in desktop mode (higher resolution cube faces), and the tour I created using the krpano droplet (2nd link above) works in mobile mode without glitches.
Ok, thanks for your return. It's in our todo list on mobiles/tablets bugs. If it's working with krpano droplet, it should be working on Panotour Pro 2 due to the same player engine. So I've noticed your report.