Hi.
I am having problems running the EJS versions of the software on most of my computers. I am running vista professional (not running) and vista home (running.) All computers use the latest Java download. The download version does not work on any. In all cases, the reported error is a class not found error. For example, for the thick lens simulation, I get this at the console:
[code]
Java Plug-in 1.6.0_11
Using JRE version 1.6.0_11 Java HotSpot(TM) Client VM
User home directory = C:\Users\TM
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basic: Starting applet teardown
basic: Finished applet teardown
basic: Starting applet teardown
basic: Finished applet teardown
basic: Starting applet teardown
basic: Finished applet teardown
basic: Added progress listener: sun.plugin.util.GrayBoxPainter$GrayBoxProgressListener@4204
basic: Added progress listener: sun.plugin.util.GrayBoxPainter$GrayBoxProgressListener@124111a
basic: Added progress listener: sun.plugin.util.GrayBoxPainter$GrayBoxProgressListener@20f443
basic: Applet loaded.
basic: Applet resized and added to parent container
basic: PERF: AppletExecutionRunnable - applet.init() BEGIN ; jvmLaunch dt 229231 us, pluginInit dt 80837119 us, TotalTime: 81066350 us
HotEqn V 4.00 HotEqn
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cHotEqn V 4.01 HotEqn
basic: Applet loaded.
basic: Applet initialized
basic: Removed progress listener: sun.plugin.util.GrayBoxPainter$GrayBoxProgressListener@20f443
basic: Applet made visible
basic: Starting applet
basic: Applet started
basic: Told clients applet is started
basic: Applet resized and added to parent container
basic: PERF: AppletExecutionRunnable - applet.init() BEGIN ; jvmLaunch dt 229231 us, pluginInit dt 80852335 us, TotalTime: 81081566 us
HotEqn V 4.00 HotEqn
Scanner invalid character:  
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cHotEqn V 4.01 HotEqn
basic: Applet initialized
basic: Removed progress listener: sun.plugin.util.GrayBoxPainter$GrayBoxProgressListener@124111a
basic: Applet made visible
basic: Starting applet
basic: Applet started
basic: Told clients applet is started
network: Connecting http://www.phy.ntnu.edu.tw/ntnujava/ejs/org/opensourcephysics/ejs/LauncherApplet.class with proxy=DIRECT
basic: Added progress listener: sun.plugin.util.GrayBoxPainter$GrayBoxProgressListener@2ab653
basic: Applet loaded.
basic: Applet resized and added to parent container
basic: PERF: AppletExecutionRunnable - applet.init() BEGIN ; jvmLaunch dt 229231 us, pluginInit dt 83423492 us, TotalTime: 83652723 us
HotEqn V 4.00 HotEqn
Scanner invalid character:  
Scanner invalid character:  
Scanner invalid character:  
cHotEqn V 4.01 HotEqn
basic: Applet initialized
basic: Removed progress listener: sun.plugin.util.GrayBoxPainter$GrayBoxProgressListener@2ab653
basic: Applet made visible
basic: Starting applet
basic: Applet started
basic: Told clients applet is started
network: Connecting http://www.phy.ntnu.edu.tw:80/ with proxy=DIRECT
network: Connecting http://www.phy.ntnu.edu.tw/ntnujava/ejs/org/opensourcephysics/ejs/LauncherApplet.class with proxy=DIRECT
network: Connecting http://www.phy.ntnu.edu.tw/ntnujava/ejs/opticsLensNMirror/opticsLensNMirrorApplet.class with proxy=DIRECT
network: Connecting http://www.phy.ntnu.edu.tw/ntnujava/ejs/opticsLensNMirror/opticsLensNMirrorApplet/class.class with proxy=DIRECT
network: Connecting http://www.phy.ntnu.edu.tw/ntnujava/ejs/opticsLensNMirror/opticsLensNMirrorApplet/class.class with proxy=DIRECT
basic: load: class opticsLensNMirror.opticsLensNMirrorApplet.class not found.
load: class opticsLensNMirror.opticsLensNMirrorApplet.class not found.
java.lang.ClassNotFoundException: opticsLensNMirror.opticsLensNMirrorApplet.class
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:http://www.phy.ntnu.edu.tw/ntnujava/ejs/opticsLensNMirror/opticsLensNMirrorApplet/class.class
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 7 more
Exception: java.lang.ClassNotFoundException: opticsLensNMirror.opticsLensNMirrorApplet.class
Ignored exception: java.lang.ClassNotFoundException: opticsLensNMirror.opticsLensNMirrorApplet.class
[/code]
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Thanks for everything.

TM