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