When I drag a tab to reorder, sublime freezes for a moment and becomes unresponsive. If I move the cursor down (ever so slightly) it will almost always move the tab into a new instance, regardless of releasing the tab in the current instance's tab space.
If I click a tab, wait a few seconds, and move the tab up some (def. not down) the other tabs will begin to animate as I move the tab.
If I at any point in time move the tab down slightly, sublime will freeze for several seconds.
Customer support service by UserEcho