Well, you've probably already thought of this but I will try taking the document piece by piece down until it works fine.
Like removing all initial actions, macros, removing all sheets and graphs, removing groups, removing input fields, etc.
It will take some work but will probably speed things up with support.
Another idea might be recreating the document from scratch and see if you're still having problems.
It appears that the client can't reach the server on port 4747 and looking at the image I would say you don't have your linkmachine set correctly. See if the attach document will help. Look at the last couple of pages.