I tried it also and got some unexpected behavior. If you have another program open, like another copy of Aspire, and that window is maximized in the background and the focus is on Aspire in the front-most window, following Highpocket's instructions will result in changing the focus to the window underneath. The window underneath must be maximized to full screen or nothing will happen.
I've disabled double click handling on the toolbar and list button. This won't have any effect from the user's point of view. At best, it will eliminate the issue. At worst, it will narrow the problem further from our point of view, as we're still unable to reproduce the issue.
This will be in V9.009, so keep an eye out on it please when it's released.