Not sure if this is a big deal for anyone but brand new users. With the release of 2.1.1, there is no default story format enabled automatically. When creating a new story with the +Story button, giving it a title, and selecting +Add, nothing happens and no error message is thrown. It works fine AFTER selecting a story format.
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Which operating system (brand, version, edition, 32/64bit) are you using?
If the web-browser based release, which web-browser (brand, version, 32/64bit) are you using?
I tested the web-browser based release on Windows 10 using the latest versions of both Chrome and Firefox, and all new story projects I created automatically defaulted to Harlowe v1.2.3 without me needing to either set a default story format for the application or change the story format for the new project.