I just ran into this problem after just upgrading today to Yosemite. I was copying a bunch of large (2 GB+) .vmdk and other files + three folders out of one of my VMWare Fusion into a separate folder. I noticed right away that the progress window didn't display, although each individual large file in the destination folder showed the progress indicators (I believe, in the Size column). After copying 7-8 of the files + folders the progress stopped. All of the files that have yet to be moved are represented by grayed-out entries, with the Size showing Zero bytes. However, the file copy progress stopped, with no indication of what is happening.
I then tried to initiate another copy of the remaining files. Finder didn't ask if I wanted to replace the existing files, keep both, etc. - it just automatically started creating separate copies of each file with a " 2" at the end of the file name. I cancelled that and went looking for an explanation.
I tried opening a separate finder window where I again started copying a few files. I got the progress bar, and an attempt to copy an existing file presented the Keep/Copy/Replace prompt.