When I e.g. press Control Panel or any other item I get an annoying big white dialog, which after closing pops up after every action. See screenshot. However when I click away the dialog the dialog (only possible via clicking the exit cross at the top right corner; the exit cross in the red bar on the left doesn’t work), then all is green, appendix 2. I run the default Atum template for the backend and the Cassopeia template for the website. Strange is that I cannot remove the old j3 templates, although they are not selected.

How can I fix this annoying problem

Expected result: backen with annoying pop up window

Actual result: see appendix 1

System information (as much as possible)

Additional comments