Java suddenly not working. Red X

My java was working fine until a few days ago. I tried going into a TalkCity room that I usually visit and it comes up like it is going to load, but then the red X comes up. All other sites that require Java work fine. I un-installed java and re-installed it, so my version is current (1.6.0_07-b06). Around the time that it stopped working, my computer was going pretty slow so I did an update on everything, ran Norton, Spybot, CCleaner..then it stopped working. I checked all of my settings, Java is enabled for everything with no restrictions. I even downloaded Firefox because I read elsewhere that it would work, but it didn't. I did a disk cleanup and defragmenter too..still nothing. I even did a system restore today, back to before I was having problems, thinking that maybe I did something with all of the updates that would mess it up, but that didn't even work.
When I run the Java Console, this is what comes up:
java.lang.NoClassDefFoundError: PChatPanel
     at java.lang.Class.getDeclaredConstructors0(Native Method)
     at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
     at java.lang.Class.getConstructor0(Unknown Source)
     at java.lang.Class.newInstance0(Unknown Source)
     at java.lang.Class.newInstance(Unknown Source)
     at sun.applet.AppletPanel.createApplet(Unknown Source)
     at sun.plugin.AppletViewer.createApplet(Unknown Source)
     at sun.applet.AppletPanel.runLoader(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: PChatPanel
     at sun.applet.AppletClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClassInternal(Unknown Source)
     ... 10 more

>
You should be aware that this is a forum for discussion for Java developers. It is not an end user support forum.
At any rate your issue is a problem with the site in question. "java.lang.NoClassDefFoundError: PChatPanel" means that resources the program needs cannot be found. This is a problem with that site and you will have to address it with them in order to resolve it. Nobody else can help you with this because it is a site problem and beyond our control.

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