Yup, happened all over. I took an 84% knock, refunded before margin call. The Jury is still out on exactly what caused it, speculation is human or server error (I'm not convinced a human can cause that), other suggestions are uncertainty from Brexit.
I'm putting it behind me, concentrating on recovery. Closed GBPUSD and USDJPY (won't be trading these anymore, too uncertain, when Brexit is finalized I will open those charts again).
For every loss there should be at least an equal and opposite profit.