See the link above to the Java console.
The log that's output by the IntegralFTP applet is in the Java console. You can find instructions on showing the Java console at http://www.java.com/en/download/help/javaconsole.xml. Once you've opened the Java console, you should see lots of logging from IntegralFTP. Please copy that and e-mail it to support@enterprisedt.com.- Hans (EnterpriseDT)