One of the lines in the 2005/04/26 log file causes Webtreds to crash. Not sure why, but I've commented it out with a pound sign (#).
2005-04-26 15:18:19 200.201.0.30 - W3SVC12 PROJECT2061 198.151.218.130 80 GET /esp/tools/benchol/ch2/ch2.htm - 200 0 58973 582 0 HTTP/1.0 www.project2061.org Mozilla/4.0+(compatible;+MSIE+5.5;+Windows+NT+4.0;+YComp+5.0.0.0) - http://www.google.com/search?hl=pt&q=tipos+de+problemas+matem%C3%A1ticos&btnG=Pesquisar&lr=