I've had this issue for over two weeks now. Any document that is not recent enough (over 30 days old), is not loading. It takes aaaaages (there's a loading circle that appears next to the file name that supposedly shows the progress, but it stays always the same, very close to 0%), and then suddenly an error pops up "The operation was cancelled".
I've tried quitting box and opening it again, quitting the apps themselves (Preview, Microsoft Word, Adobe InDesign), but nothing fixes it.
Help please! I can't work without my files.