Hi Have you tried resettting your workspace. (see my attached screenshot, btw CustomX is a workspace I created myself but you can reset any of the other workspaces you use)...
Also try deleting the cache files in the dreamweaver usually called something like 'WinFileCache_1-E4854B7D.dat'
they are located in: (Winsows 7) Also you may need to shows all for Folders & Files from the Control Panel
Computer -> Local Disk (C:) -> Users -> YourName -> AppData -> Roaming -> Adobe -> Dreamweaver CS6 -> en_US -> Configuration