I have several Magic Mice and they all work fine APART from on my Mac Pro 2009. On these machines their movement is jerky and they keep losing connection. I have tried everything! So I went out an bought a BT dongle (Sitecom) and it works perfectly. However, as soon as I re-boot the Mac does not recognise the BT dongle and the mouse stops working. I then have to remove and re-insert the dongle and re-establish a connection with the mouse. Any ideas how I can keep the BT dongle recognised when the system re-boots. I did not install any BT drivers with the dongle.