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(Note: I realise that @Viper007Bond has unfortunately passed away. I register this issue here in the hope that someone will take over and look into this and in the hope I can help someone else with the workaround I found.)
When I insert SyntaxHighlighter code blocks containing right angle brackets (for instance, xml) and preview /publish the page using a user with role "Author" or below those brackets get tranformed into their HTML-entities and this breaks the syntax highlighting.