tlwright:
I strongly suspect that the issue is weird characters in one or more book titles or author fields in LT. For example, you have this book in your collection:
Note that foreign language characters (Unicode) and accents (ë, õ, â, etc.) should be fine.
The method I am using to retrieve your LT books is "all or nothing". I either get all the books or nothing at all, so I can't "check" the books for errors before displaying.
I was able to retrieve your books using the tag
Cooking, so there's nothing wrong with your configuration or library.
I'll reach out to the calibre "Development" forum and see if there's any way to improve the situation.
In the meantime, if you're really set on using LT Match, you could check your LT catalog for weird characters in the title or author fields. Exporting your catalog to Excel might be the easiest way to do this.