The mouse on both my husbands and my Mothers Chromebooks stopped working yesterday. Don't think that can be a coincidence! I'm wondering if it is the latest update - they are both on 120.0.6099.259. I found that if I remove and reinsert the little USB thing you plug into the laptop, then it recognizes the mouse. Anyone else experiencing this? My Chromebook is on version 120.0.6099.235 and is working fine.