Do the following and see if you can reproduce this weird error:
1- Open the application (regardless on trial or get key mode)
2- Add a viewport container.
3- Bring any config option using the filter (i.e. layout) and modify it.
4- Click once on the filter for the config components and press backspace.
A double-click will bring the prompt to the filter, but before I realize that this screen comes and terminates the designer application.