I have been using the permalink structure for a while now: /%category%/%pagename%/
recently, on a few of my wordpress blogs, this have been causing a 404 error.
when I switch back to the default permalink structure, the posts then appear online no problem.
asked my host and there was nothing they could do. said it is a wordpress problem.
I don't have many plugins installed either on this one particular blog so dont think there is a conflict there.
please help