For some reason, wordpress is returning a valid page when it most definitely should not. This is screwing up my google listings in a very big way.
For example, let's say:
... is a valid url.
WordPress is also returning any and all of these as valid:
I have 432 pages that are now indexed under the wrong url, tripping duplicate content filters and have lost all pagerank as a result.
I have no idea why this is happening or where it started ... I assume with the last upgrade? Any ideas why this is happening? Could it be related to supercache?