webdav issue with office 2010 and 10gR3

Hello,

I am using COAO with office 2010. It is exhibiting very strange behavior. The first COAO works fine, the second one on the same document opens read only, the third COAO works fine etc.

I noticed while looking in the logs that the lock file doesn't seem to be created on the even check out and opens. Has anyone else come across this?

There is nothing online or in Metalink about alternating read only.

Thanks

steve