Hi -- as per title, it seems TextFlow introduced a new method with a signature clash of a method in TextFlowExt.

openjdk/jfx@04c5e40

Both these may need a rename:

getUnderlineShape(int from, int to)
getCaretShape(int charIdx, boolean isLeading)

So as of now RichTextFX cannot be used with JFX25+ ....