Twine v2.3.0 beta 3 "Testathon" issues

[HiEv]

Here's the list of issues found during the "testathon" for Twine v2.3.0 beta 3:

• There were some issues with the splash page which appears the first time you run Twine. Closing and re-opening Twine seems to fix those problems.
• Adding a story format might not work properly if they have the same major version number as a story format which is already installed. Closing and re-opening Twine will make the new story format vanish if it wasn't added properly.
• Opening a story with a story format that's not installed just gives you an empty window with the grid background.
• Changing story formats may trigger an error which requires restarting Twine and also fails to set the new story format.
• Clicking outside of an editor window to close it, instead of using the "X", triggers an error.
• The v2.3.0 beta 3 tries to convert stories in the "Documents\Twine\Stories" folder to HTML, however it only does that successfully on one file each time you open the beta.
• Duplicating stories fails to set the starting passage.
• SugarCube v2.21.0 comes with the install instead of v2.28.2.

[klembot]

I've listed most of these out as separate issues. I don't remember seeing the editor not loading with an empty background, though. Is that possible to reproduce?