The problem is that the tabs are often too touchy on different platforms. The slightest twitch of the mouse when clicking on a tab will often result in tabs being moved/reordered. So we increased the distance necessary for a drag event to be registered as a drag. We did that back when crashes related to tab reordering was common. Unfortunately that's an app-level setting. It affects all drag distances. And it's often a different default on different platforms. I'll look into making it a user preference so people can choose their own happy-medium.
Speak up folks! Don't suffer in silence. The worst that can happen is I'll tell you to get stuffed.
