Has file copy dialog disappeared in OS X Yosemite? I recently upgraded to OS X Yosemite, and I noticed that the file copy dialog in Finder seems to have disappeared. Instead, I am shown greyed out entries of the files being copied in the destination directory, with the successfully copied files turning to black.

How do I cancel a file copy, especially if the copy operation consists of multiple large files and I want to cancel the copy midway? The file copy dialog seems to have disappeared.
It turns out that Box Sync was indeed causing problems. I uninstalled Box Sync and the progress dialog in Finder reappeared.