Got a new 27" imac (2017) with SSD, base 3.4 CPU. After booting up and getting to the desktop, the new mouse will not work for about 10 seconds... I move it around and around and eventually the cursor pops up on screen... Not "end of the world" but weird. Any idea about a fix ? It's obviously recognized by bluetooth, it's charged.. It's the only mouse in the menu... and it works fine otherwise... The keyboard (also bluetooth, new extended) is recognized immediately (since I can type a password) That machine is sooooo quiet !