I've been doing some margin trading for a few days now, mostly making money for Kraken with fees, and always fighting against bots (I will probably buy one) and today more and more of my orders were cancelled, until I got the reason, Kraken doesn't have any more funds available for leveraging.
Too bad, but a bit reassuring at the same time that they don't allow unlimited marginal trading, I guess.
Oh... So that's what this message means?:
Reason Insufficient margin
I thought it was another bug or something related to MY margin (which would be weird as I have way more funds than margin used).
Interesting to know. The bad thing is that if you don't notice it on time you can assume some orders have been executed when in fact has been cancelled afterwards. Fortunately I am always taking a look at my order history.