[Plugin: Quick Cache ( Speed Without Compromise )] Back to broken

My blog locked up again after reinstalling Quick Cache. At one point, my blog was down for 55 minutes. I have uninstalled Quick Cache and reinstalled WP 3.4.1 and have not had the problem for over a week. Definitely broken or incompatible with one of my other plugins.

http://ww.wp.xz.cn/extend/plugins/quick-cache/