For me the problem is seen in Syndication. When I alter a page that has some sort of entity in the title or some attribute of the feed, it introduces a problem in Thunderbird which is my principle aggregator. The //problem// is in Thunderbird and since it re-encodes the & at the beginning of XML entities in the feed and I will get what Thunderbird reports as a "new" page every 15 minutes or so since the latest page no longer matches the previous "latest version" cached by Thunderbird.
I don't use Aggregation within my Dokuwiki at
http://www.puzzlers.org/