花了一些时间，但我终于找到了一个解决办法，如果没有一个答案。碰巧的是，我的定期计算机将停止让我拖 - 放的任何的。解决这个问题的解决办法是按 ESC 骨节病>（退出）键，即时恢复功能。

It took some time but I finally found a workaround, if not an answer. As it happens, periodically my computer will stop allowing me to drag-and-drop anything. The solution to this is to press the Esc (escape) key, which instantly restores functionality.