I use Krusader for many reasons and one of very important to me is its archive handling that allows you to browse archives as if it was a directory.
After upgrading to Ubuntu 9.04 few days ago I’ve found that handling of zip archived in Krusader is broken. Instead to open archive Krusader was starting Archive Mounter (which looks like a new feature as I didn’t have it in Ubuntu 8.04). This was very irritating and I wasn’t sure what’s wrong. At the end, solution was simple… In Krusader configuration open Protocols panel and add application/x-zip MIME to the krarc protocol.