I am currently a Ninja/Zen customer. I had a stop limit at 618.60 in ZG and when it traded at that price, but wouldn't fill, Ninja was acting funny, so I tried to cancel the order with red x. It was completely locked up, control center show nothing at all, no working order nada. I had go into task manager and end the whole Ninja session. As of the writing I spoke to John and Ninja canceled and go a refund, 1 day into my renewal. My mentor and friend has had his ladder lock up, but the chart keep working. Beware folks, this just cost my $40 per contract ( a profit it appears I should have had after looking at the chart ) plus a commission. I am glad I am just piking a 1 lot. Maybe in the future I will give it another go, but for now I don't believe it is ready for prime time.