StressedEd writes: "For some time it seems that the London Stock exchange has been suffering some "technical difficulties", with execution of orders currently suspended. With thousands of people relying on reliable real-time data and billions of dollars of trading matched each day, these systems should be highly reliable. Clearly however things still go wrong. Does any one have experience of such trading platforms? What horror stories or near misses can you divulge and what goes on behind the scenes? The LSE is one of the largest and oldest exchanges in the world, having actively traded stocks in one form or another since the late 1600s."