Tab list on my stash keeps disappearing...

I have to manually press the "Show tab list" button every time I want to change to a different tab, and the tab list goes away each time I change to one.

It was fine earlier today. I don't know what I did to make my stash do this.

Any suggestions? I've only tried restarting the game, and that didn't work. Really don't want to have to re-download everything again, but if it's my only option, or even AN option, to fix this, I guess I'll do it.