The plugin *seems* to be serving cached files (as they are served quite faster than what appear to our logged in editors) but there is no status message attached to the footer anymore (<!-- Cached page generated by.. -->).
I have checked the headers as well and nothing can be found there in reference to the caching.
I have just noticed this after the latest upgrade a couple of days ago. Anyone else experience the same issue? Any other way of making sure that the cached files are being served?