I have recently discovered that my 500GB hard drive was steadily getting more and more fragmented. I was using Disk keeper Pro 10 which was showing drive performance instead of file structure. It never defragmented the last 1GB of files on my hard drive no matter what settings I used and displayed my drive as fully defragmented. However, my GalCiv games kept getting worse and worse until finally I started getting farms built that wouldn't produce food and when I built food distributon tiles over the farm tiles my food production jumped up to 100 mt/wk. Also the game kept randomly dropping to the desktop. Uninstalling Disk Keeper and returning to windows default defragmenter corrected the problem. Apparently Disk Keeper 10 pro was one of several defragmentation utilities that doesn't work with drives above 100GBs. This fragmentation problem slowly gets worse until major game stuff happens. Please keep this in mind when looking at possible bugs.