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IE9 appears to have broken my mshtml com based WebBrower html editor in my 32-bit winforms .net 3.5 application. (It has to be set to 32-bit due to an activex USB device controller I have to use.)

The bug is erratic - it doesn't happen on my system. If my customer runs IE9, and then my 32-bit application with the WebBrowser based html editor, my app hangs, no response. This did not happen with IE8.

This is so screwed up I don't even know how to formulate the question.

P a u l
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    Depending on how you create the Web Browser control you can use Browser feature delegation to specify which version of the Web Browser control runs. More info here: http://www.west-wind.com/weblog/posts/2011/May/21/Web-Browser-Control-Specifying-the-IE-Version. – Rick Strahl May 22 '11 at 22:04

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