When searching previous posts, I get a 404 error that the post can not be found. I've discovered that this occurs only with post prior to February of this year (2008).
Clicking on the permalink or on comments yields the message:
Sorry, you are looking for something that isn't here.
If I am logged in, there is no problem. I've tried this with a test user as well. Not logged, 404 errors. Logged in, no problem.
I've tried changing the Permalinks but get the same result no matter what form of Permalink I use. BTW, if you place the cursor over the post title, it will indicate what the link address is.
My site is:
Any ideas or clues will be greatly appreciated.