The same thing just happened to me, and more.

All my accounts were hacked! On the 5/31/2016 payment e-mail was changed to another in Shutterstock, Istock and Dreamstime. They managed to withdraw money from Dreamstime, Skrill (yes, they hacked my skrill account too) and maybe Fotolia (I can't really see to which e-mail the money from Fotolia are going, but I wrote to them and expect them to answer. And I did not authorize credit convertions on this date).
elnacho, did you find any solution for this? How can we stop that theft? And from where do they know our passwords? If anyone has some knowledge about internet security and protection - we will be very greatfull for some advice.