I could have sworn that I had workflow working on a site that I was playing with - however today I went to look at the versions tab and am told that workflow and versioning has not been set up for this site.

I go into Site Manager, Development, Workflow and have a default workflow schema set up with steps + scope of the web site that I've been playing with - yet in the pages it tells me that it hasn't been set up.

Any ideas on why this would have stopped working, what I need to check or do to get it working again?