OK, I tested the following:
When I deactivate the MultiHighlighter, that works.
Still it detects "CSS" in the Statutsline of the Editwindow.
While CSS Highlighter is not activated (Checkbox).
If I change the file extension in the CSS-Highlighter settings to *.cssX,
then the Highlighter finally gets deactivated!
But the crashes persist anyway.
So it seems to have to do with this base64 part.
Can I deactivate some other option for test?

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