In previous versions, I was able to drag the icons from the right hand menu into the effects chain. Now when I do that, the icons fade in color and bounce back to the menu. The only way to put in an effect is to click on the plus in one of the boxes in the effects chain and select from a pop-up menu that appears. Even this seems a bit erratic. Is this a bug or a design change? I am running Linux Mint 18.3, which is based on Ubuntu. Thanks.