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Finally I found the cause of the problem.
The following directory somehow got to be 'read only' and did not let apps write access:
User name\AppData\Roaming\

This caused a lot of strange issues...

I get the error seen in the attached picture.
Can this be related to having no extensions in the Extension manager window?

32241

Thanks, but it seems to be some other issue.
My old laptop shows the extensions list without a problem, but my new laptop does not.

I switched to a new laptop. Everything seems ok, except for the extension manager that will not show any extensions in the list.
Checking for updates works fine, so I guess that Fusion is not...