I too am having this SIP related problem
But resolving it by replacing IE files from older build doesn't seems like a good idea to me. After all, in previous two releases, IE is heavily modified, its much faster. Anybody can suggest a different way. I am using QVGA sys shared by dsi76. I had problem with bluetooth too, there was no Connect via bluetooth option in Activesync, I resolved it by using btasplugin.dll from 21501 build. But I dont understand what is causing this problem. I have WinCE.nls in SYS folder too. What am i missing???