I'm running a Repress 0.1alpha14 over a WordPress 3.3.1. The proxy seems to work fine for me but links on proxied sites are not being conveniently parsed.
The different thing
The only thing I found suspicious in my installation is that my wordpress directory is not my site directory. My WordPress installation was made following these official instructions to give WordPress its own directory. (See: Moving a Root install to its own directory).
You can see my plugin installation at: http://www.carloscapote.com/blog/repress.