Problem with latest version of Java

I have used the Audit My PC Sitemap Generator for almost a year without any problems. I had been running version 5 of Java and a few months ago, I tried installing Version 6. As soon as installed it, the Sitemap Generator started having problems mapping my web site. It would find all the HTML files, but would report failures on all the graphics files such as GIF files. I still had Version 5 installed, so I simply uninstalled Version 6 and the problem went away.

Recently, I started receiving notices that I should install version 6 and I thought maybe the problem was due to the fact that I had two versions installed. As a result, I uninstalled Version 5 before I installed Versions 6. Now the old problem is back and I can’t figure out what is causing it. Since I uninstalled version 5, I’m stuck trying to make version 6 work.

The site has about 1000 pages and maybe 3000 graphics. I have tried increasing the memory size, with no effect. I have also tried changing other settings and the problem still occurs. I’m pretty sure my site is not causing the problem, because it worked fine under Java 5 and the sit hasn’t changed since.

Looking at the problem in more detail, I can see that the failures are not being caused by a timeout, which is where I usually see errors. When the program tries to load a graphics file, it fails instantaneously. I don’t see any entries in the "Problem List" like I normally do when there is a timeout error.

The system page shows the following information:

Memory*usage
Free*memory 66.0*M
Total*memory 117*M
Max*memory 127*M
System*properties
package.restrict.access.org.mozilla.jss true
java.version.applet true
http.auth.serializeRequests true
os.version.applet

Does anyone have any ideas?
Thanks in advance for your help.
Larry