Logging into our reporting site causes invalid taskbar preview

I'm trying to help a coworker with this problem. We have identical machines, so my machine information is applicable. However, we don't have identical problems.

When she logs into a site we use for generating reports (I believe it's a sharepoint site) in Internet Explorer 9, she gets a new taskbar preview with only a small icon in it seen here.There is no corresponding actual window and the preview cannot be closed until the browser and all its tabs are closed.

While this preview exists, she cannot open any file in a shared drive that our groups uses through IE9. She must close IE and reopen it before she can open files again.

There are three of us in our group and she is the only one having this problem. The other guy says he had it for a little while but then it went away on its own.

I can't even think how to describe this in a simple Google search that will get any applicable results. Does anyone have any insight as to what is causing this?