Yes, this just happened to me too. The only app I see is IFFTT (which I think is new). I used to see all the usual ones like YouTube, Hulu, Netflix, etc.
I read on the internet that I should connect to the Tivo service twice and then reboot, so I'm working on that now.
... and OMG! that worked! Not sure how, but I'm glad to have all my apps back.