This exact same situation has also started happening on our production BizTalk 2006 server Standard edition (Windows Server 2003 R2 – 64bit – sp2). This system has been running fine for years, and then a month ago BizTalk went into this zombie state for the first time. Then it happened again last week, and again today. There was nothing in any event log in each case, and restarting the BizTalk service got all the files flowing again.
Any help would be greatly appreciated!