We're upgrading from MediaWiki 1.13.2 -> 1.15.4. One of the issues we see is that when a page is searched for which in which the page name contains special characters, the page cannot be found.
Specifically, if the page is called A&B (A ampersand B) and I type A in the search field it will (correctly) show me A&B as a search suggest. When I select A&B I will go to a page marked A with this message:
There is currently no text in this page. You can search for this page title in other pages, search the related logs, or edit this page.
The URL will be correct:
(This is also seen if I press Random page several times until I come across this.)
Anyone know how this can be solved?