Version:           1.1.1 (using KDE KDE 3.1)
OS:          Linux

When naming a new item or re-naming an existing item in the tree view, you have to hit 'enter' to terminate the action.  If you click elsewhere while changing the name, usually nothing happens--you can't select anything. 

Sometimes, I find clicking around eventually does something, but the re-naming is cancelled, or the new item disappears. (This may be a separate bug, but the following suggestion fixes it anyway.)

In most modern interfaces, it is enough to click outside a text field to finish an edit action.  Here, of course, the name has to be valid: non-null, alphanumeric, and unique.

If the mouse is clicked outside of the name box in question, the name should be validated, and if valid, the naming/re-naming should be completed and the click processed further (possibly to select another item). If the name is not valid, an alert dialog should be raised explaining this to the user, and the edit should continue.