Why isn't the sidebar showing up when I select a new window?

There are several times when you click a link, and it opens a new window. During that window, you will not be able to open your sidebar. Because you are opening a new window, all of the existing configurations in your sidebar are not brought to the new window. Therefore, we recommend opening a new tab within your existing window. To do that, you need to press CTRL + CLICK on the button instead of just clicking it (as you normally do). That will force the new tab to open in your existing window, and Drumkit will work as expected.