I executed "./make-run" to start Web Crossing and I got:

Error while initializing webx-run: ./webx-run error: could not open database file "webx.db" for writing [Permission denied]

Your current user access level doesn't permit you to run Web Crossing.

Under OSX this usually means you forgot to "sudo" first (sudo ./make-run)

Under other *Nix OSes you either are not logged in as root, or whatever user your system administrator requires.