Really really minor, (but should be on a list somewhere)
When I press the [Challenge] button in the ladder, and get the “You can’t challenge this player because: Player already has the maximum number of challenges” it should be possible to toggle the message away.
Why? Because the message is huge, it does not wrap and it burns through a huge chunk of screen real estate on my little laptop.
I can see why it stays, (the rejection is probably still true and don’t want the screen to flicker/CSS-shuffle which can be confusing for users.) but there should be a user initiated dismiss option.
Love the site, and interested by the new API for 4.0