cmd-tab switching to terminal app does not show the visor window

I have 1.5.4 installed, I have the preference "auto-slide when terminal.app activates" checked. This used to work but recently (not sure exactly when, i suspect after a recent reboot) it has stopped.

I am not sure what other information I can provide other than it just doesn't work. I need to use the hotkey for the visor to display every time. Let me know what else I would need to provide.

Thank you.
Matt.