I use IB and the crossed prices for the last 30 min today was nuts. Is this the brokers or the ecn's fault, any particular one? A year ago I didn't notice it as much but seems if activity picks up it happens. Anyone able to shed some light on this? When it happens with a nyse I will put the symbol on the page with nyse routing selected instead of smart and that always fixes the problem, but with nasdaq what can be done?