reset the workspace layout:
go to Window -> Work Space layout -> Reset '<your layout name>'
in some cases, you may need to restart the OS, then delete the cache file again for that to take effect. after resetting the workspace, I Would try restarting the OS and deleting the cache file again.
If you continue to have problems, please include some more details about your system:
What is your OS?
What version of Dreamweaver?
What other extensions, including the version numbers are installed.