My Burn Disc radiation symbol disappeared form my sidebar (after being there when I would put in a blank disc) for the first 4 days of having Mojave... then it disappeared and won't come back after NDRAM rest, SMC rest and numerous restarts. I can burn a disc but only right click with a mouse and have to guess at the capacity for the disc that's left. It also started grouping files in my download folder to where the arrow disappeared and AppleCare told me to reset the Finder Preference for Groups under VIew. So it's done these two things on it's own (plus when I put in a blank disc, it doesn't ask to accept or eject the disc, even though it's set for that and did do that for the first 4 days).... Just wondering if anyone else has this trouble. Apple, of course, just said 'do another re-install and see what happens. Thanks