Silverlight 4 crashing every browser (SL3 doesn't)

I am testing my appli开发者_如何学运维cation on a number of machines. It is fine on every machine except 1.

I'm having problems with one XP machine where in internet explorer, chrome and firefox the Silverlight plugin crashes on EVERY page with Silverlight.

Pages that used to work fine with silverlight 3 crash instantly - including my app and the Silverlight Beta 4 demo page!!! The browser crashes instantly and doesn't even attempt to load the page.

I don't know how to debug this because there's no error. It just crashes instantly in all these browsers. Reinistalling, rebooting didn't fix the problem.

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I'm not sure what it might be, but you could try debug it this way.

1. Attach to running instance of Firefox with Visual Studio.
2. Go to menu Debug -> Exceptions... and check all "Break when exception is" boxes.
3. Now open page that crashes the browser.

Ideally you should catch an exception with debugger. I've spotted this way OutOfMemoryException in my app. Browsers were crashing with no reason, but debugger showed the right direction...

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Fixed in RC/RTM (at least for me!)