I'm having a serious problem with the permalink structure of a child blog. We're using WordPress multisite to power a blog+mobile version, using the sub directory approach and multipost mu plugin to duplicate content from one version to another.
The problem appears when an editor logs into the system and try to edit a post: the mobile version gets redirected to a post in the standard version. The redirection problem is then fixed by updating the siteurl and home url in the super admin menu.
The weird thing is that it's always redirected to the same post, and it only happens with editors, not with admins.
We tried changing the blog url to a different one (before it was mydomain/m and then we changed it to mydomain/mobile) but the problem persists: as soon as an editor logs in, the url are lost and the child blog is redirected to a different post.
Any light would be appreciated in order to fix it, this is a very annoying problem.