I had this last week.

YOur last workstation is logged in as a user who does not have enough access rights to the workspace. I can't tell you exactly which rights you need. I hit it with nuclear weapons and gave 'Everyone" full control on the entire workspace folder. WHen I have time (and money) to spare I will start tightening it down, but it's in a small office of 3 people, who should have those rights any way.

More info, this is proven by connecting to the DB from the client via SQLCMD or MSSMS.