Version: (using KDE 4.2.0) OS: Linux Installed from: SuSE RPMs both, RSSNOW and the NEWS plasmoid are using the same type of dialoge to add new rss-feeds. they are able to refresh theri selfes and to show the new content. but after closing and openening them all added rss feeds are away. bug is there since kde 4.x.x releases. i think there is no config-file.
Do you mean closing configuration window and opening again or remove widget and add again?
Closing as outdated.