Updated to 3.5.10 Elements this afternoon. On re-starting Dorico and opening a project, the “converting to new version” dialogue popped up then opened up a really weird blank score with bizarre graphics! Simply rebooted my Win 10 computer and all was sweetness and light once again. Haven’t got round to updating my Macbook yet but if the same thing happens, then forewarned is forearmed.
Hope this helps.