I/O Read Data value wraps around 2147483648 bytes to -2147483648 and goes up to zero etc. So the value shown in System Explorer is truncated-to-32bit version of what I see in native Windows Taskman. Consider using larger variables for large data!
Version of the System Explorer: 3.5.3.4157 Portable, 3.6.2.4291 Installer Version of the Operating System: Win7 Ultimate 32bit What settings do you have changed compared to default installation: Ticked I/O Read Data, I/O Write Data columns in Processes tab Step by Step description how to invoke invalid behaviour: just run a heavy I/O process and wait