I also have a version of this problem, although my computer does not crash.Whenever I hide the chat, it crashes both Showdown and shortly after, my computer.
In the Windows downloadable application client the hide button which should hide the chats, exits the client. I do not know if the app is crashing or if the button is assigned the incorrect funciton. I can attach a video if you need one, but there's nothing really to look at. The client is normal, then I press the hide button, then the client closes/crashes.