With enabled SyntaxHighlight_GeSHi, VEForAll throws
TypeError: Cannot read property 'on' of undefined
Javascript error.
This can be fixed by adding
"ext.geshi.visualEditor"
to VEForAll's extension.json ext.veforall.core dependencies. It would be good, if the missing dependency could be added dynamically as soon as SyntaxHighlight_GeSHi is available.