Problem in starting Integration Repository

Contrary to another thread that I found, I am having problems starting Integration Repository for the first time after installation. I followed the instructions of the installation guide up to the point of running SXMB_IFR to launch SAP Exchange Infrastructure page, and after clicking on "Repository (Design)" link, the java web start first check for the latest version, then it goes berserk trying to start the application (the progress meter flashes) and ~2 hours have passed as I am writing this. The documentation warns of a long starting time but this?? Appreciate it if any fellow friends have encountered this before and leave your comments...

Another thing: "Directory (Configuration)" link works without a glitch, comes up in 2-3 minutes and I am able to log in. Weird...