IE9 release date

It's set to March 14, 2011: read this blog.

I hope they fixed the bug in IE9 that mysteriously stops your applications, etc from working correctly when it is installed. I have had this problem and it is very annoying it even affects the system even though do not have the browser open.

I haven't seen one of those so it might be isolated and perhaps add-in related issue.
However, lots of things were fixed - you will have much more pleasant experience (guarantee it).