Version: (using KDE 3.5.9)
Installed from: Debian testing/unstable Packages
Steps to reproduce:
-change the url of a feed
now the archive only contains the latest items from the new feed.
I can confirm that problem with Akregator 1.2.50 from KDE4.1RC1 Kubuntu packages.
The problem is, that the filename of the archive files is built out of the URL. As the feed entries of the feeds.opml file already have an unique idea, it may be a good solution to use that idea to use that ID as filename.
*** This bug has been marked as a duplicate of bug 190059 ***