You should actually change the port back to 5432, as this is the port that Postgres listens on, it is not the Tomcat port of 8080 and has nothing to do with HTTP. The address, if Postgres is running on the same machine, should remain 'localhost', otherwise it should be the IP address of the machine it is running on (typically an internal address).
Reviewing your logs, I can see that you are having the same problem that other users have had with the new Monitor role in the properties files. This was causing the blank screen originally. Please follow the instructions in the User list post by Paul Galvin, linked here: http://www.openclinica.org/pipermail/users/2008-June/000679.html