The wheel of my mouse is essential to the work that I do as most 3D programs allow for a middle click hold function in order to orbit around digital models. However, the last few weeks the middle click button of the mouse when clicked filters through the open windows of my desktop. This has been a huge inconvenience and the mouse has worked well with my Dimension 4600 for the last couple of years. Even with a replacement mouse the error still comes up and even with the correct function assigned to the middle click button in the control panel the same issue arises. Any ideas?