In IE9 when a user downloads a document, IE hangs and you see in the process manager that the memory is rising like crazy.
Mostly it doesn't hang fully, so a uses doesn't see it.
- Go to the Document details of a MS Word document
- Click on Download
- Click on Open (Save also does the same)
- Go to the top menu and click on Sites
- Normally Sites stays open, but it doesn't anymore