Please see this post for additional information.
A few people have reported an issue with version 1.4.1 that prevents it from extracting any archives. I recommend that you do not upgrade to version 1.4.1 at this time. It may be a few days before I'm able to fix the problem and release a new version, so please continue to use 1.4 or 1.3.1 for now. I'll post another note once I've had a chance to fully investigate.
As hinted at in the 1.4 release post, some bugs and other issues related to internationalization support were found rather quickly. Functionally 1.4 should work fine, but there were some display issues, etc. that needed to be tweaked. So, I'm releasing 1.4.1 as a quick bugfix release to address these problems. I included translation files for Chinese (Simplified), French, and German with this release. Any contributed language files that I receive after this release will be posted to the main Universal Extract page for download, and they'll also be included in future versions.