In 8.161, have found that an error occurs when trying to edit any settings in the section of the Advanced Tab, HTTP/S, including logging allowed / blocked sites, changing target services, etc. Please see screenshot for the error that is displayed in red. This was working fine under 8.160 (at least the changing of logging settings, that is something I did mess with under the last version).
ETA: Forgot to mention, this occurs under IE8 and Firefox.
