I had the same problem... Jetpack causing the visual editor to not work.
The cause of the problem, in my case, was that I had WP installed in one directory, but had a symlink set up pointing to that directory. The symlink path/url was what was set in my WP options.
I renamed my WP directory and deleted the symlink and that fixed the problem.
In other words...
/wp - wordpress directory
/mysite -> wp (symlink to wordpress directory, originally created with ln -s wp mysite)
/mysite - wordpress directory