The "blob" is the movie that they play while they are working on a calculation because everything must be animated today.
When I try your query on several different browsers, including Chrome Version 35.0.1916.153 running on Windows 7 64, I am not able to see the blob that will not finish.
Perhaps you could submit all the details, os version, chrome version, query, etc to the WolframAlpha support people and see if they can reproduce this, track the cause down and fix it.
