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Just for general interest, was there a problem at the site, or should I be worried about my setup?
Everything seems normal now, and I didn't change anything.

I am not aware of any issue on our end, but if it happens more often feel free to let us know.

I still suspect that it's in my end, but now it occurred again - here is the log:

Java Plug-in 1.6.0_26
Using JRE version 1.6.0_26-b03 Java HotSpot(TM) Client VM

sun.plugin2.main.client.PluginMain: unrecognized message ID 42
load: class ipp/BatchPrinter.class not found.
java.lang.ClassNotFoundException: ipp.BatchPrinter.class
at sun.plugin2.applet.Applet2ClassLoader.findClass(Applet2ClassLoader.java:252)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Plugin2ClassLoader.java:250)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Plugin2ClassLoader.java:180)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Plugin2ClassLoader.java:161)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Plugin2ClassLoader.java:687)
at sun.plugin2.applet.Plugin2Manager.createApplet(Plugin2Manager.java:3025)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Plugin2Manager.java:149

at java.lang.Thread.run(Thread.java:662)
Exception: java.lang.ClassNotFoundException: ipp.BatchPrinter.class
load: class ipp/BatchPrinter.class not found.
java.lang.ClassNotFoundException: ipp.BatchPrinter.class
at sun.plugin2.applet.Applet2ClassLoader.findClass(Applet2ClassLoader.java:252)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Plugin2ClassLoader.java:250)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Plugin2ClassLoader.java:180)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Plugin2ClassLoader.java:161)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Plugin2ClassLoader.java:687)
at sun.plugin2.applet.Plugin2Manager.createApplet(Plugin2Manager.java:3025)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Plugin2Manager.java:149

at java.lang.Thread.run(Thread.java:662)
Exception: java.lang.ClassNotFoundException: ipp.BatchPrinter.class
load: class ipp/Main.class not found.
java.lang.ClassNotFoundException: ipp.Main.class
at sun.plugin2.applet.Applet2ClassLoader.findClass(Applet2ClassLoader.java:252)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Plugin2ClassLoader.java:250)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Plugin2ClassLoader.java:180)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Plugin2ClassLoader.java:161)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Plugin2ClassLoader.java:687)
at sun.plugin2.applet.Plugin2Manager.createApplet(Plugin2Manager.java:3025)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Plugin2Manager.java:149

at java.lang.Thread.run(Thread.java:662)
Exception: java.lang.ClassNotFoundException: ipp.Main.class

Hmm, that is strange. It looks as though the puzzle application cannot be started correctly. I agree that it probably is specific to your computer. Do you have any custom settings in your antivirus software? or special security plugins in your browser? Also, does this happen on every browser or only a specific one?

Since that time it hasn't occurred again, so I guess it's not worth investigating unless somebody else gets the same problem.

I don't use antivirus because I use Linux and load programs only from the approved sites. I have Adblock Plus but no security plugin.

This happened on Chromium, but when it happened the first time, I tried Firefox too. Didn't work until it started working with Chromium as well.

Yet another variation: now it doesn't work on Chromium again, but Firefox works.

EDIT: 5 minutes later, works also with Chromium.

As it happens, I'm actually using a similar setup as you. I'm currently on Ubuntu 11.10, with the exact same Java plugin (Java Plug-in 1.6.0_26 Using JRE version 1.6.0_26-b03 Java HotSpot(TM) 64-Bit Server VM), only the server edition.

In Chromium, your particular error message does not happen for me. I do have a security alert every time I go to the puzzle page saying "The Java plug-in was blocked because it is out of date". When I accept this alert by entering "Run this time", the applet seems to works fine. Do you get this alert or did you handle it in another way?

No such alert, but I know it because my fiancee has it sometimes on her Windows laptop. And as with you, it works after clicking "Run this time".

I have Mint 10 now. I accept the upgrades, so it shouldn't be outdated. But I'll change to something, if I get real trouble.