It happens that the tab Groups all get lost suddenly and no new tab groups can be made by hovering a program over another. This never happened in Groupy 1. It is extremely bad when you spent a lot of time to build all tab groups and then that happens. It would be better to keep an old version of a software that runs without problems before the development of that old version is stopped and a new version where the basic functionality does not work is released.

the only thing to make it work again then is to click this button twice:

https://i.imgur.com/mQcd5vF.png