I know...it's minor, but it annoys the heck out of me.
On *some* servers, when you drill down to a user in AD/UC and double click the user in the right-hand pane, instead of opening the Properties, it simply expands the container in the left-pane.
A right-click on the objects shows that "Properties" is not bolded as the default double-click action. There is no default action.
Can this behavior be controlled or changed?