Cannot add or create custom components

Since at least 24 hours, I cannot create or add components in my projects.

When I try to add them in the Widget Tree, they flicker into the tree and out again. Sometimes, a few screens later I suddenly get the "this would have caused a crash..." message, maybe from there?

When I try to create a component, I see the pop-up to enter its name but cannot type there - though it seems like the input is received by the now faded out system.

Has anyone else this problem? Or, even better: have you had and resolved it?

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