I'm new to the game and am having a tough time getting Showbox to work on my Nvidia shield. Do I need a separate mouse to get it working? I have a controller but when I try to navigate around the app, it doesn't do much. I can just move the selector around the filters but that's just it. I can get Showbox to scroll up and down through the listings but the selection highlighter doesn't move.

Do I need to get a mouse to use this? I also tried installing an older version but that gave me the same issues