I set up a filter which deleted files older than 30 days, and I used to be able to go to a folder, press K to select them all, and then press Ctrl-J in order to run the filters.
Now it has stopped getting rid of the old ones, no errors that I can see, just leaves the folder as before. This is Kmail that came with 2.2 (the one that is currently in testing). Thanks for any thoughts David