Within a few seconds of opening a document in CC 2018, a hidden dialogue box pops up behind the application, blocking any ability to click on options in the app until that box is closed. Problem is the box is hidden and nowhere to be found so all you hear is a beep each time you try to press anything. Force quit is the only option and this means not a single bit of work can get done. On Mac OS High Sierra 10.13.3

Very frustrating