Whenever I start a new game after a while the programm crashes. I'm just gonna post a link to 4shared where I uploaded the debug.txt file. This only happens on Minetest 0.2.20110731_3. The previous version (minetest 0.2.20110602_0) works just fine.
http://www.4shared.com/document/7kA13IaJ/debug.html