From a user of mine,

I create a new document in the destination folder, in this case "working edits" folder, then I gather documents in my starred folder and sort them (usually these are filed documents). Then I copy them and paste them into my new document that is in the destination folder. Sometimes there are already things in that document and sometimes not but after that paste happens the document is unable to be edited at all. You can’t tag, add or move pages. It just blinks and doesn’t accept the changes.

I'm trying to find out why this happens. My guess is that WF might be evaluating the document which then freezes the client. My used have to log out and back in to get it working again. Client version 10.4