For some reason, previously viewed messages are persisted between launches of testpanel. This might be the intention but it seems like the log is not fond of it.
If I doubleclick on the messages nothing happens unless I create a "Sending connection". If I close Testpanel, I get asked for every message in the list if I want to persist it.
Moreover, a 'clear-all' button would be nice. Attached is a screen dump + log from the testpanel.
Forgot log ...