I have a number of child pages with totally numeric permalinks that were working prior to my 2.5 upgrade:
parent page permalink: stuff
which has a child page with permalink: 2222 (which would be /stuff/2222/)
Since 2.5, /stuff/2222/ now resolves to (generates the content of) the parent page /stuff/. A child page with a permalink consisting of letters (i.e. /stuff/blah/) does work correctly.
I'm assuming this has something to so with url rewriting/resolution... is there any solution to this other than changing all my numeric permalinks?
In addition and curiously, I remember numeric tags behaving somewhat similarly to this (but I never looked any further into the problem); however since upgrading my numeric tags work now.