Not a big issue for me since I've grown accustomed to hitting "F" (it's closer to the "e" key), but when I push spacebar to flip a card, it loads this page up right after flipping my card. So essentially you can't use space, you have to use F.

I use Opera 10.52 (or whatever the latest version is).

Just a little bug. Not a huge deal. I use F anyways.