After many hours of angst and messing about, removing, reinstalling, changing the compatibility mode, deleting registry keys, you name it I had a hunch the issue was something to do with the site(s) cache.
I save my websites in a folder on the C: drive named 'Sites' I renamed this 'SitesSAFE' and then opened Dreamweaver. Problem solved!
I then deleted all the sites in the Site Manager in Dreamweaver. Closed the program and re-opened it. Closed the program and renamed the 'SitesSAFE' folder back to 'Sites'. I still have the annoying issue where I have to remove and import the site every time, as DW8 is not remembering the FTP passwords, but I don't care. I can live with that.
Dreamweaver 8 is running in compatibility mode for Windows 7. Nothing else is checked. I have uploaded an image if you can go to the link below.
I have used DW in it's various guises since the year dot. Bring back Macromedia... I begrudge companies forcing me to pay a subscription for software. It's a cash cow for them and a drain for the users. I also prefer to program mainly in ColdFusion and Adobe have dropped support for ColdFusion in the latest version of Dreamweaver. I also code in .NET and trust me, ColdFusion is by far the better language, but hey the Microsoft bullies appear to be winning the day, once again! Good Luck...