Running multiple instances

I'm in the process of upgrading from 4.5 to 5.0. I followed the instructions on this page http://community.screen-scraper.com/MultipleInstances. (There is no link to this page from the FAQ list. The only way I found it was on a tiny link on the install wizard). The workbench works fine, but when I attempt to run in server mode and attempt to start a session from a java program, the calling program blocks and I never see the session starting. This is now the case for the new 5.0 instance and the original 4.5 instance. I uninstalled the 5.0 and the 4.5 is still behaving this way.

I'm doing this on a Dell laptop running Windows XP. I suppose I'll have to re-install version 4.5 from scratch, but how do I get the two instances to run? Also, I wasn't trying to run them concurrently although I did edit the conf to use different port numbers.

Bruce Baron

Additional Info:
I realized that since all of our sessions are run locally on the default port, we always instantiated the single argument RemoteScrapingSession constructor: RemoteScrapingSession session = new RemoteScrapingSession(sessionName). However, with the dual instance configuration, I switched to the 3 argument constructor RemoteScrapingSession session = new RemoteScrapingSession(sessionName, host, port). In this case session.scrape() is blocking. I had set the port to 8779 instead of 8778, which is the web interface port. I guess this is the one port that won't throw an exception, but causes the client to block instead.