Keeping your computer system up-to-date is important, but every once in a while an update can cause a problem. Recently, Internet Explorer 9 caused some trouble with Intuit Merchant Services. In our office, what we saw is that hitting the "submit" button to complete a transaction did nothing at all (no error message, no response). If you clicked away to "cancel", then an error message would appear. Turns out there are several symptoms reported: web pages missing information or not rendering properly, downloads not working, "Page Cannot be Displayed" when accessing known good links, and similar problems.