Javascript aggregation issue with new server
It's likely that your web server isn't sending the correct Content-Type or Content-Encoding header for compressed files.

Adding one of these to your httpd.conf file should solve the problem:

AddType application/x-gzip .gz .tgz


or 

AddEncoding x-gzip .gz .tgz


There should be comments in your httpd.conf file that will help you determine which one's most appropriate for your situation (search for &lt;IfModule mime_module&gt; in that file if you're interested).