There is a later version of the jQuery tablesorter plug-in which fixes this..
If you would like to patch this before the next release:
Replace the contents of 3rdparty/jQuery/jquery.tablesorter.packed.js with the content found here: http://tablesorter.com/jquery.tablesorter.min.js
Be sure to keep the Copyright notice intact.
There is a later version of the jQuery tablesorter plug-in which fixes this..
If you would like to patch this before the next release:
Replace the contents of 3rdparty/ jQuery/ jquery. tablesorter. packed. js with the content found here: http:// tablesorter. com/jquery. tablesorter. min.js
Be sure to keep the Copyright notice intact.