The Mac installer version loads up GO with no problems, but the platform-independent version doesn't. I'm using the 'advanced' interface and OBO file adapter, and the initial dialog box looks normal. I click 'OK' and get a normal-looking progress bar, but at about 66% it craps out.
With 512M allocated to O-E, I just get a partly-blank version of the load dialog (shown in attached pic). If I up it to 1536M, it manages to tell me "Load error - Java heap space". This seems pretty poor, given that I can load and browse GO with 1536M in the installer version of 2b27 (and I run O-E 1.x with 768M to edit!).