Archangle's suggestion works exactly for my Dell Latitude E6510 running Windows 7 (64 bit). SPO2 v 1.2 installed OK and runs fine, but the apparent data file remained empty, until I used Archangle's suggestion, and found the test files exactly where he suggested (C:\Users\%YOURUSERID%\AppData\Local\...

I've noticed the same thing for a week or so - the main page shows only the lifetime stats. However the program is working very fast and flawlessly otherwise.