[Pharo-users] Pharo 2.0 - System Error Handling Failed

I am running the Pharo 2.0 beta, and I am getting a lot of System Error Handling Failed events. Is this simply a product of the beta status, or have I somehow enabled some kind of debug switch? For example, in a workspace I execute a doit on: fd := FileDialogWindow new. fn := fd openInWorld. When I click OK in the dialog box, I get the System Error screen. On other occasions I get the screen, press space to continue, then I get the debug window, and when attempting to debug it bounces me back to the System Error screen. Normal behaviour for the beta, or operator error on my part? Cheers Andy