My inventory opens, as normal, but then I cannot pick up objects with one click. I have to hold down the button and drag things across. But that's not it. I also can't shift click, and holding a stack and placing down objects one at a time is near impossible. Even in creative mode, dragging objects is difficult. Also, if I am holding the object (with my mouse being held down) and I let go onto another object, the item simply slides back into its original spot. This is very annoying and makes crafting so much harder. I tried closing the browser multiple times, and even restarted my laptop, so it is a Minecraft issue. I hope you can find out what this is.