I can't help you with the name problem, other than to suggest maybe it doesn't like the name? Try something simply like Oak1 (unless you've aleady called another one that!!) and see if that takes, and then try changing the name.
As far as the logs, they aren't saved. In other words, you will only see events that are happen after opening the log view. To demonstrate that, you should be able to open the log view, and unplug and re-plug (or disconnect power and reconnect if you have it setup up differently) one of your oaks, and it should show a disconnect and connect message within 5-10 seconds. If you have your oak sending publish messages, you'll also see them listed whenever they fire. Same as messages about new code being loaded.
Pete