Review_Date shows up blank in the preferences pane and Employee_Row does not show up at all. This worked previously and I'm not sure if cleaning up and removing (i.e. deleting) old leftover variables caused the issue or the new release.
set myVar to current date
tell application "Keyboard Maestro Engine"
setvariable "zzzzDate" to date string of myVar
end tell
tell application "Keyboard Maestro Engine"
make variable with properties {name:"zzzzDate", value:date string of myVar}
end tell