Any issues for screen-scraper running in server mode on ubuntu server 8.04 64bits?

Dear Sir:

I had followed pages:"http://community.screen-scraper.com/invoking_screen-scraper_from_java" and "http://community.screen-scraper.com/Tutorial_3_page_4_Using_Java" to setup an external java application to get extracted titles of dvd from screen-scraper running in server mode (scraping session by Tutorial 4) on ubuntu desktop 8.04 32bit in WMWare successfully.

Problem occurs while screen-scraper running in server mode on ubuntu server 8.04 64bits.

The following is the part of my codes in external java application
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1 RemoteScrapingSession remoteSession = new RemoteScrapingSession( "ShoppingSite");
2 DataReceiver dataReceiver = new MyDataReceiver();
*3 remoteSession.setDataReceiver(dataReceiver); //I try and mark this
4 remoteSession.scrape();
5 System.out.println("Finish scraping");
6 remoteSession.disconnect();
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I had done some following testings
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1. External java application and screen-scraper running in server mode on ubuntu desktop 8.04 32bits
External java application gets returned data from screen-scraper successfully.

2. External java application and screen-scraper running in server mode on ubuntu server 8.04 64bits
2.1 - No marking line 3 above -> can't get "Finish scraping" and external java application won't finish.
2.2 - Marking line 3 above -> get "Finish scraping" and external java application finish

3. External java application on ubuntu desktop 8.04 32bits, and screen-scraper running in server mode on ubuntu server 8.04 64bits
The same results like testing 2.
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I did't try screen-scraper running in server mode on ubuntu desktop 8.04 32bits and exteranl java application on ubuntu server 8.04 64bits because I don't know how to open ports for outside connections in VMWare now, but I will try it later.

I can't find suitable solution for my problem from Forum,FAQ,Documentation,etc in screen-scraper official web site, and I'm not sure whether it is because of screen-scraper running in server mode on ubuntu 64bits or not.

Thank you

PS:

Settings for ubuntu server 8.04 64bits

JRE - 1.6 version
Screen-Scraper - enterprise version
ia32-lib - 2.2 version