The Scribus Manual (for 1.4.2), and the Wiki, say in various places, "Is Locked will lock all characteristics of a frame, such as position, size, and contents.", but I can lock a text frame and still change the text, font, colours etc. The only things that seem to actually be locked are its position and size, but not its contents. Also, locked image frames allow the image to be changed and effects to be added.
From how it currently works, 'Is Locked' should mean: "Is Locked will lock the position and size of a frame, but not its contents.".
Is this a bug/feature or are the manual and Wiki both wrong? Or is it just my installation that's at fault? (I can't remember what it used to do prior to 1.4.2 so I'm not sure if it's always been like this.)