SOLVED Fresh install on local machine - CKEditor no advanced toolbar

[Felix]

Btw, I can see the full toolbar in this window I am writing right now ...

if you have it working then we can mark this thread as solved.

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About more information to help in a better way.
The GS cms has an inbuild diag information page:
3 ways show that page:
1) click on the support button
2) at the bottom click on support, then click on Website Health Check
3) or add health-check.php directly at the end in your url