Forms position and windows task-bar when first opening in IE11

We are moving to IE11 and have noticed that when we first open forms, the very bottom of the screen gets hidden behind the Windows task-bar (which is fixed and due to other reasons cannot be set to auto-hide). Previously, it opened in front of the task-bar. The issue is very minor as re-sizing the screen resolves it instantly, but our customer is keen to find a way of changing the IE11 behaviour so that it mimics what was happening before (they are worried that end users might not realise that the very bottom of the screen is hidden behind the task-bar, and therefore not re-size their screen, and consequently miss error messages, thus causing more calls to their internal helpdesk). Can anybody help us find a solution?