I was vending things from the Mystery Box for Major Drills Quest. I clicked on try again to get a new item and only a few seconds later on the buy button and was presented with an error message: "Oh No! You have to get a new item!". I got that error 4 times. Despite of this error message I seem to have gotten the items. I now have 10 items from the Mystery Box in my inventory. 6 I vended correctly and apparently 4 from when I got that error message. I have no idea if it took the sp when the error occurred because I did not pay attention to my sp on hand. The vends where the error happened did not count for Major Drill's quest (It says: "Pull 7 items from the Mystery Box. (6/7)"). Thought I'd report this as it's a bit strange.

I'm using Firefox 37.0.1 on Windows 7.

Yes, the UA informed the programmers and they fixed it. So this thread can be locked. :) (sorry, for the late response. I somehow didn't notice the ping notification.)