I don't know if it's some setting with the Trackpad Accessibility option's (using a MacBook Pro), but whenever I tap (not physically click) the trackpad on the top section of any Messages window, whether it be an individual person message or the main Message window) and then tap somewhere else on the screen, the whole window moves to where I tapped. In the Accessibility settings I've tried both Without Drag Lock & With Drag Lock, neither make a difference. The only application that I've seen this happening with is Messages. Safari, Notes, Mail, etc., doesn't happen. How do I stop this? It's so irritating.