This is probably already known, but I didn't see any mention of it, so I thought I'd post to be sure. There appears to be a slight bug related to closing AB. If you have unsaved roster changes, and try to close the app while it's minimized (by right-clicking the Taskbar entry, and selecting close), AB prompts you if you want to quit with unsaved changes. But it doesn't restore the app before doing so, so you can't see the dialog. At this point, AB is effectively unresponsive and locked -- and there is no way to restore/maximize it. (It appears to not respond to future windows events). Killing it with task manager is the only option.