I previously blogged about an issue I was experiencing building a custom pipeline component in BizTalk Server 2006, and that I had found it was fixed and was not longer an issue in R2. Now there is a KB (KB941802) out that deals with a fix for that problem in 2006. I think the description of the problem in the the KB is somewhat limited, for a more detailed description read my post. So if you are experiencing an endless loop behviour in BizTalk 2006, get this fix.