This problem has now been fixed by the Dreamweaver 11.0.2 updater. If you are still having problems, contact Adobe technical support.
Dreamweaver will not work on a user account that has File Vault enabled. This is a known restriction. To quote the Mac documentation:
Because your home folder is encrypted, some tasks that normally access your home folder may be prevent
Thanks to Jim Bloom for providing the basic information for the following solution: