I'm having this same problem using the same Mac OS High Sierra. Windows are missing on startup even if I open up a document I can't see it to work on it. For some reason after quitting InDesign and restarting it works and looks normal and the windows launch, but it is frustrating because every day since the last update it starts off with missing windows until I quit and relaunch it.
I'm having this same problem using the same Mac OS High Sierra. Windows are missing on startup even if I open up a document I can't see it to work on it. For some reason after quitting InDesign and restarting it works and looks normal and the windows launch, but it is frustrating because every day since the last update it starts off with missing windows until I quit and relaunch it.