According to your hint I did the following:
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I deleted 30 percent of my items - the ones which are easy to recreate. The idea was that I probably get the one causing the problem.
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Since this didd not help I “flattened” my model removing most of the parent groups.
This looked like:
This solved the probklem. The model page is loading again and I was able to rerarrange the model. But in fact I was unable to detect exactly which Item / Group nesting caused the issue. Anyway, I worked.
But for some future realeases I hope that the GUI gets some logic to prevent this kind of misconfiguration.
Greetz
Christoph