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<p>Hello,</p>
<p>support contacted me some hours later, and problems are half way
solved. Update did not update any module, they were all stuck on
9.0.x. The same in former updated systems incl. virtual test –
only the problematic phenomenon ("Deserialization of core data
failed") did not occur or not the same way. I was not aware I need
to take a look at module list and check version numbers after
wizard told me update went through...<br>
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<p>The search is running now without exceptions, but still two of
three do not work on site, show empty content. On the other hand
in one use a different formatter than configured is used. We'll
see how support can help further...<br>
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<p>Lost a lot of faith into product...<br>
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<p>Regards,<br>
Thorsten<br>
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