The only thing you can trust is your trace output! 03 October 2016 Daniel-Fisher-(lennybacon) Tools, Productivity, C#, VisualStudio The Visual Studio Team is in the process of switching the debugging engine (at least since VS 2013). Today I experienced a really scary behavior. Here is a screenshot of the legacy engine and the new one – both failing to show me that the List<T> contains 75 items, but in different ways. Lesson learned: The only thing you can trust is your trace output!