We have a pdc running server 2008 R2, when I run gpupdate on the server, it waits for about 5 minutes on "updating settings....." then finishes normally. I installed gplogview. Running gplogview /m shows gpupdate runs through everything, next policy processing in 5 minutes, but gpupdate is still waiting on updating settings a while before finishing.
I have tried rsop.msc returns "this operation returned because the timeout period expired".
gpresult returns "access denied".
I have seen the reregistering of userenv.dll, I get an error message when run with the /n /i switch. (that solution is almost always posted under 2003 server not 2k8).
I have also checked the group policy logs and have no errors, dcdiag has the rodc error which microsoft recommends ignoring in leu of a rodc server.