I just noticed that there are two instances of Internet Explorer in the Browse From menu of the web application, and when I tried to set one of them by default, the same instance was always installed by default. I think IE9 did not delete some registry data. So, when I browsed my application several times with other browsers, the second instance of Internet Explorer disappeared and my problem stopped playing.
Now when I start debugging my VS2010, the message "Attaching the Script debugger process" ... "to the machine" ... "failed. The debugger is already connected." In the task manager, I see two instances of IE - one x64 and one x86 ... I will see questions on this topic.
Hope my post helps someone else.
Thanks, Daniel, for your attention.
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