Thanks for the clarification on the version numbers, zzynx. And I'm really glad to hear that epCheck is still working for you.
With that in mind, just now, I refreshed all the data, twice (first time saw no change), and now all the show dates etc are back.
In the past, I've had a show or a couple of shows have their data disappear from the Series list. The show's title is still there but the episodes, air dates, etc are gone. I've always just 'Refresh series data' and the info comes back. This time was very weird - all the data for all the shows was gone, just blank spaces. And, obviously, all the listings in the Weekly and Monthly tabs were not there.
What a relief! I can't tell you how much I rely on epCheck to keep track of my big/long list of shows.