My issue is identical.
I've also searched around and contacted support etc, to no avail.
Its very frustration as I use briefcases extensively, between all different work sites with different operating systems and I don't want to start using a different add-on program.
I'll let you know if I get any other info though.
I just upgraded to Windows 7 from XP and am having a problem using Briefcase. It will error out saying files are on a read only disc and not accessible.
Anyone have any ideas how to correct this?