After years of enjoying Yum, I made the sad mistake of "upgrading" to Yum version 4.0.2.
1. The user interface is completely new, and I'm already tired of seeing the repeated drawing of the chef's toque and red pepper, over and over again. The previous, list-style interface is more compact and makes it easier to find recipes. Under the ubiquitious toque-and-pepper icon, only a small portion of the menu title is visible, making it hard to tell which is which, even among the relatively few that I can see at one time.
2. When I try to add a new recipe, I cannot paste a list of ingredients as before.
3. When I select one category, then click on the toque-and-pepper icon for some recipe, I see "Category: Unknown".
4. When I open an existing recipe, I see that all the paragraphs are numbered, which is pretty silly for those that are not cooking steps.
5. Everything is in a harder-to-read gray font -- with serifs, no less, making it even harder to read on-screen.
I sent these objections to the developer, with examples, and his response was prompt, polite, and helpful. Then I reverted to Yum 3.2.2. If you are not already a Yum user, I do recommend buying version 3, if you can.