Yes, this is fixed in rc1. There was a regression in beta2 which prevented any new files from being created, but didn't interfere with editing existing files; I guess most people had already created their files with earlier versions of PortaBase, because nobody reported the bug for almost a week.

I did just notice there's a bug in updating the list of recently used files when importing an XML or MobileDB file in rc1; just fixed it, but it's pretty easy to work around in the meantime (just open the newly created file using the "Open" button or menu item next time, it'll then get correctly added to the recently used files list).