When you hit an assert when shutting down IE, it means we have some memory leak. It does not necessarily mean YOU have introduced some new memory leak. In order to verify, please run following pre-check-in tests. If it does not hit the same Assert, it means you haven't introduced any memory leak in the following code path. Test I: 1. Start Run "{c:\windows\system}\blank.htm" 2. Select File->New Window 3. Close Both Test II: 1. Start Run "http://ohserv" 2. Click a link to "Development BVT" 3. Click the go back button -Satoshi there is an erroneous assertion for a CUrlHistory object. it gets freed after the assertion on MSHTML process detach. this will be fixed post IE3 ship t SHDOCVW MAIN: D:\NT\PRIVATE\windows\shell\ccshell\shdocvw\basec\..\mainloop.c at 151: 1 blocks of C++ objects left in memory. Read shdocvw\memleak.txt for detail -ZekeL