-open the demo
-search for 'bat'
-lots of search results (page 3, 10, 11, 12)
-click on "Page 3" on the left side (the pdf page thumbail)
-page 3 is in display on the right
-now either klick on the '>' button or use the mouse scroll wheel to display the next page (4 or 5 or 6, doesn't matter which)
-now klick on the page 3 thumbnail on the left side

-> nothing happens
-> i would have expected the display of page 3 on the right