Don't worry... I've managed to reproduce the bug. 1. Sign into Skype (I have "Sign in when Skype starts" enabled) 2. Sign out 3. Enter password on Sign in page and press the "Sign in" button 4. Skype closes down without warning. Neato! And there's no information in dmesg, so it's a silent crash/close. Now, if only we knew where to report all of these Skype bugs...