I had the same thing happen to me last week. For the past 12 months I've been using the new invoices feature with deposits enabled. The other day it was disabled, and when I went to re-enable it, I got booted to the old style, which I've never used before. It's much more cumbersome and support was no help at all but were very firm about there being no way to revert back to the "new experience" and could not provide a timeline for the full rollout.