From advanced search in new Default skin, I tried to search for a song name "t".  The browser "Loading..." indicator continued to spin.  I tried to abort the search by pressing backspace (back in browser).  However, after the previous page was taken from the browser cache, I couldn't then do anything.  I pressed the browser refresh button - nothing happened.

Eventually after some time, the browser refreshed and everything was back to normal.  I guess the search continued to run in the background, blocking other operations until it completed.