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Next generation Applet causing Silverlight to block when creating Webclient object

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I've got a problem where the "next generation" version of the Java Plug-in is causing problems with Silverlight on Windows XP. I can easily reproduce the issue with simple test pages. I have a variety of simple test pages, but one example is:

1) HTML page loads, which loads my Silverlight component. The Silverlight component does almost nothing, other than creating a Webclient object (which would be used for making HTTP calls, but for this test page I'm not doing that).

2) Click a button to open a simple hello world Java applet in a modal dialog.

3) Close the dialog.

4) Refresh the page, which causes the Silverlight component to reload.

5) --> The whole browser is locked for 60 seconds.

As I said, this is just one scenario. If I use JavaScript to load the applet directly in the page, then I can get the browser to lock forever.

The issue is present for both IE7 and IE8 on Windows XP. I don't see the issue on Windows 7.

If I uncheck the "Enable the next-generation...." checkbox in the Java control panel, the issue does not occur.

I'd appreciate any ideas on how to work around this issue, since I need to support this scenario.

My HTML Object tag to load the applet is simple:

Here is the object tag that loads the Silverlight component:

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