Hi Serpens - thanks for letting us know about this. It's the first I've heard of an issue like this, but we'll look into it.
Hey Dargo,
sometimes the yubikey confirmation does not work. I'm not sure if the problem is the yubikey or if there is another problem.
But when I want to confirm a withdrawal it happens often (~20% of the time), that I get the message "the submitted form has expired" (or something like this, I did not copy the exact wording), even though not more than 15 seconds have passed.
Nonetheless the bitcoins were send. So now it happens,that I thougt the bitcoins were not send and send the amount twice.
Luckily it was one of my addresses so i can send the bitcoins back. But what if it was not my address? So you should fix this issue.