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This is a list of bugs in Twine 1.4.1. Some of these may be carryovers from Twine 1.4, and some may be newly introduced. All of these will be fixed in 1.4.2.
For Windows users (at least?), attempting to build a game of any kind may cause an error instead. This is due to the timestamp included in the HTML: if the locale's month name or timezone name contains a non-Latin-1 character, then the error will result.
If the filename of an image has a capitalised suffix (such as “.JPG” instead of “.jpg”) then Twine will give it an incorrect MIME-type when forming a base64 URL. In most (but not necessarily all) browsers, this has no effect. Furthermore, it means that Twine's “Save Image” functionality will not work with these images.
The story editor's external link detection is too permissive. If a passage name contains a full stop, and links lead to it, then it will be interpreted as a URI filename, and link arrows to the passage will not be drawn. The links will, however, remain functional in-game.
In Twine 1.4 and below, any list items (that is, lines beginning with *) in the StoryMenu, StoryTitle, StorySubtitle and StoryAuthor passages would light up on mouseover, even if they weren't a link. Twine 1.4.1 slightly exacerbates this, as non-link list items will also always produce the pointer-finger cursor, further erroneously suggesting that it's a link. (This is a consequence of fixing a 1.4 bug whereby the pointer cursor wasn't present for links in other places, such as StoryAuthor.)
If you use “Test Play From Here” to test your game from a specific passage, then the StoryTitle, StorySubtitle, StoryMenu and StoryAuthor passages won't be drawn correctly until after the first turn of the game. Take note that this does not affect test plays from the beginning of the story.