For some strange reason my diatcritics work fine for A,E,I,O,U upper and lower case but do not behave correctly for W and Y. This is true both within Glyphs program and Exported within Indesign and Illustrator.
It’s close to impossible working this out without any information.
How do you build the accented glyphs? What is it that doesn’t work? Do you only see the base letters, only the diacritic, nothing at all, is it about the positioning?