Pretty please with a cherry on top, could you bin the Java file browser that you have built into webmin and replace it with one that is say AJAX based.
I am sick an tired of having constant JAVA issues. I'm not saying they are your fault, more so Sun/Oracle and every time the blasted JAVA updates I have issues with the file manager.
Plus plenty of browsers are no longer supporting JAVA and or are about to turf it. Or have security issues.