Have updated to the latest Chrome
Version 24.0.1312.56 m
Switched to ASYLUM
skin in ADV. All the other skins (except ADV 2.0) work properly.
The missing EDIT button has re-appeared.
Everything appears to function properly!
During the snafu...1/20 - today,
Switched to Firefox
(version 18.0.1) and it functions properly using the ADV 2.0 skin.