Legacy Quad 1TB won't record or playback with new app

Last week my Tablo stopped recording and playing back existing recordings. Uninstalled the app and reinstalled the new 4th Generation (dark blue) app. Even though there were about 450 GB of programs on the internal drive (not using a USB drive), the “Settings” now shows “No Storage Device Connected.” I’ve tried power cycling and hitting the reset button several times to no avail. It will neither record new programs or play old ones - “Storage full” or something like that appears as an error message.

Anyone faced similar problems? Were there any solutions, or is my internal hard drive now just a (relatively light) boat anchor?