When in the inventory, you have to drag items by holding onto the mouse where as in previous versions before 1.8.4, you could do this without holding onto the mouse.
Environment
Mac OS X, Processor: 2.5 GHz Intel Core i5, Memory: 4GB 1333 MHz DDR3
MC-80676
Dragging items in the inventory
Resolved
Duplicate
0
Disable touchscreen mode in the settings.