The context: RH8, XHTML source files, WebHelp output.
In the output index tab, in the popups associated with index entries, topics are no longer in alphabetical order (they used to be with RH6 and earlier versions). They seem to appear in the chronological order in which the keyword was added to the topics.
I've found a similar question on the forums, dating back to 2009, with no answer.
Anybody knows now how to change this (other than manually editing the hhk file)?