Modlogan is DISCONTINUED. See the homepage. I used to be a contributor, and it was a really good software at that time. But the web has changed a lot, and log file analysis is no longer what it used to be in 2000. You probably want to use a more modern software now, with a fancy Web 2.0 user interface. This is not a bug of modlogan; just a result of it being discontinued for several years now.